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35mm is pretty close to 28mm so aside from being a stop faster, it won't give you much difference in usage really.

If it's between these two the 24-70 is the better choice.

 

What is it you shoot mostly?

 

A variety of things ranging from portraits to landscapes. I would also be traveling with the lens as well.

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35mm F1.4 has pretty bad de-centering and chromatic aberration / spherochromatism wide open.

There are lots of complaints of people going through 3+ copies and still not getting a good copy.

This puts me off buying one.

Maybe I should buy 3 copies and test them and keep the best one?

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Love my 35/1.4.

Oh and no complaints about decentering here, it's very sharp and renders beautifully. A very special and versatile lens.

 

Then there's the 50/1.4 Planar which is lovely too, but AF is rather slow and noisy and it's definitely in a weight class I would say is on the limit. But image quality is beyond anything else except maybe 85GM. I love the results I get with it.

 

Have you also thought about 24-70GM and 55/1.8 combo? Or rather 16-35...?

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At first you need to decide depending on your style what the lens needs to deliver. As you indicated size and weight doesn't matter. What about budget?

 

I would consider either 35 or 50/55mm.

The 35/1.4 Distagon basically is an awesome lense, if you can get a decent copy (I gave up finding one after 5 tries of decentered ones). Excellent colors, sharpness and bokeh. Vignetting is quite high until stopped down to f2.

The 35/2.8 Sonnar is a nice and light lens (again you need to watch for a good copy). Excellent colors. Vignetting very high, and borders need f8, if sharpness is required there.

The 55/1.8 Sonnar hype was compared to my experience a little bit overrated. Excellent colors and very good sharpness. High vignetting, above average bokeh fringing and the oof rendering not so nice as I'd expect from a fast 55mm.

The 50/1.4 Planar is acceptable from size and weight. Focus sound (same drive as 85GM, "Darth Vader Autofocus") quite loud. Excellent colors and sharpness. Fantastic oof rendering, smooth transition area. Bokeh fringing can be a matter up to f2.8.

 

Honestly all 4 are recommendable. For both focal length, 35 and 50mm, I would go for the seeing the light (f1.4). As indicated check the built quality of the Distagon. For the Planar check whether the AF sound could be annoying to you.

 

If speed of the lenses is not the main requirement to you, you may also take a look onto the zooms. The 16-35/4 is a superb wide angle zoom, and the 24-70/2.8GM would deliver a most versatile focal length range.

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You should go for the Zoom 24-70 GM. From my point of view, there are three reasons for this:

1. The optical quality of the GM series from Sony is really impressive. In a test of the magazine "Alpha PHOTO" (available in Germany)  the zoom has an overall rating of 95.3% (of 100%), the 1.4/35 ZA is rated with (very good) 91.6%.

2. You already have the 2.0/28 as a prime-lens in this focus range.

3. Just for travel, a zoom-lens is much more versatile than any prime-lens.

 

Good luck!

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You should go for the Zoom 24-70 GM. From my point of view, there are three reasons for this:

 

1. The optical quality of the GM series from Sony is really impressive. In a test of the magazine "Alpha PHOTO" (available in Germany)  the zoom has an overall rating of 95.3% (of 100%), the 1.4/35 ZA is rated with (very good) 91.6%.

 

2. You already have the 2.0/28 as a prime-lens in this focus range.

 

3. Just for travel, a zoom-lens is much more versatile than any prime-lens.

 

Good luck!

 

 

Agree with this - from reports the 24-70 is as good as using a prime in most cases.  Versatility is important for travel, events etc.

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I had the 35mm 1.4 and the 50 1.4 as well as the 85 1.4. When I tried the 2.8 zoom I was sold on it and did the following. I traded the 35 and the 50 for the the 24-70 2.8 and the 55 1.8 which is light and easy to walk around with. I now have less repetition and more versatility.I would suggest you go for the zoom. I kept the 85 as it is an amazing unique lens that is lots of fun.

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If weight and size not an issue for you, then sell the 28mm f/2; its a high value for the money lens and a keeper if you want light and small, but its not in the same league as the other lenses discussed here. Some people really prefer primes over zooms. If that's you, then go with the 35 1.4 and the 85 1.4 (maybe I was lucky, but I have the 35 1.4 and it is simply amazing). If you are okay with zooms, get the 24-70 2.8 and the 85 1.4.

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I have the 24-70GM including the 35mm f1.4, 55mm f1.8 and 85mm GM primes. The fast primes are sweet for portrait work if you want to isolate the subject.  I've no complaints about any of them.  The 24-70GM is so sharp and versatile that I'll think twice about packing another lens unless I have something very specific in mind.  It's a workhorse and there's no doubt that if I could have only one lens the 24-70GM would be at the top of my list. 

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