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I've been using this lens on my A7R II for around 2 Months now and I have to say, that I'm totally satisfied with it. The AF is quite quick and accurate on the Commlite EF to Sony adapter. AF-C works really nice in photo mode and okay in video. But in AF-C the HSM motor is a bit noisy. Sometimes the lens is not recognized by the camera. I don't know if that's a problem of the lens or the adapter. This happens around every 3rd time I turn it on. Maybe the Metabones adapter will do a better job, but I haven't tested that yet. Anyway, the 20mm f1.4 Art is a pretty amazing lens for landscapes, astrophotography, architecture and even people! It is always sharp in the center, and has a good sharpness in the corners at f2.8. There are nearly no flares, chromatic aberrations are acceptable for this focal length and the Bokeh is super-smooth! I can recommend this lens to all A7 II and A6300 users! But maybe it will perform a bit better with the Metabones adapter. Here is how the lens looks on the A7R II: http://imgur.com/Cc3hHyw And here are a few sample Images:

I upgraded my A7 Mark II yesterday to firmware 2.0. Tested with Sony 85mm Batis and it worked perfectly. Uncompressed RAW no problem downloading to Lightroom 6. I also updated the firmware for the Metabones IV to version 0.46. Mounted Sigma 24mm f1.4 Art to Metabones IV smart adapter. Attempted to use autofocus in many circumstances: inside and outside, high contrast and low contrast, AF-C and AF-S. I could not achieve autofocus under any circumstances. I switched to manual focus and achieved satisfactory images. Then I switched lenses to a Canon 70-200 f4 L IS lens. Autofocus was perfect and very fast. In fact autofocus was as fast with the Metabones IV/Canon setup as native Sony lenses. I have already notified Metabones of this issue. So for the time being, no autofocus with Sigma Art just manual. Hopefully they can fix this with a future Metabones firmware update.

Anyone using the Sigma 24mm f1.4 Art (Canon EF mount) on the A7 Mk ii with Metabones IV? Sigma 24mm f1.4 Art taken at f16 1/30 second on tripod

Anyone using the Sigma 24mm f1.4 Art (Canon EF mount) on the A7 Mk ii with Metabones IV? Sigma 24mm f1.4 Art taken at f16 1/30 second on tripod