Fit/finish and ergonomics - definitely 5 stars. Construction quality is stellar. Metal barrel with built in plastic hood. Usually I hate built in hoods but this one is very unobtrusive. Very easy to install onto lens. Simple quarter anti clock wise turn (with camera facing away from you) and simple detach by depressing detach button then twist clockwise quarter turn.
My only other wide angle lens used on the A7/A7S and now A7ii is the Voigtlander 15mm ii. I think the sony's 28mm with 20mm adapter is better built but is much larger. Plus, the lens on the sony is much larger and probably easier to damage without the cap on which is a problem for me since I often leave the cap in my pocket. About the built in hood, the Voigtlander has a very annoying one. It's hood is small but protrudes annoyingly making it much larger than the actual lens' size.
Distortion and sharpness - probably a 4 star for now. only taken a few pics so far, and find distortion is present just like it is sans the wide angle adapter but is actually less noticeable. The 28mm's distortion is an easy fix with adobe raw lens profile. However, the lens + converter profile doesn't seem to be very accurate.
Picture is a tad less sharp with the adapter. However, the adapter doesn't appear to make block any light going through the lens which I initially didn't think was possible. Specs says f2.8 but I can't see too much difference light blockage wise with the converter installed.
Overall, currently very happy with it. Although I wish I had a more compact wide angle lens, the adapter is really easy to remove and is small enough to put into my pocket when I am not using it. Combined with the 28mm, the lens with adapter is a very good value compared to what I've been using which are the 35mm 1.2 and 15mm ii lenses which combined is about $900 more than the Sony combo.
For those who are manually adjusting for distortion on photoshop, please post what settings you are using. I am using +1.
Nov 11 update:
Sharpness and focus on A7ii is decent but definitely have to manual focus if you're a pixel peeper.
Happy with the f2.8 combined with 5-axis on the A7ii to take night shots hand held.
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