What are your favorite legacy lens options in 28mm?
I've tried two on my A7:
Minolta M-Rokkor 28 F2.8 - Tiny, and very sharp, but almost all lenses have 'white dots' which can spread onto the front element and cause glare/haze/splotches when shooting in bright sunlight at small apertures.
Voigtlander Ultron 28 F2 - Small and fast, but suffers from corner smearing when focusing far away at wide apertures.