Standard zooms are generally around 28-70mm, my 24-105mm extends this range a little - without too much compromise, But how do you find the lenses that go from wide to true telephoto? - I've not been tempted by them yet.
I bought the Sony 50mm f/1.8 for a video review on my youtube channel ParadiseBizz. It currently retails between $199 and $240, so it really doesn't break the bank.
I checked in my camera menu (toolbox page 6 >> version) which firmware it came with and I saw that the latest firmware version 3 was already applied.
If you don't have the latest firmware, it is easy to upgrade: https://www.sony.com/electronics/support/lenses-e-mount-lenses/sel50f18f
With the new firmware the focus is SPOT ON, it is snappy and accurate. I never missed a shot.
Even in video mode it is very good and reliable. The only problem in video mode: the AF motor is very noisy, you need to use an external mic.
But overall, for a lens at this price point: very impressive.