I don't have any real issues with image quality. When pixel peeping some of my lenses will show issues ditto if looking at across the image sharpness and vignetting and of course small cheap lenses are never going to give smooth bokeh at their widest apertures but I'm mostly happy, other issues like coma and flare aren't really significant for me. My teeny tiny collection is now at Sony 24 and 35mm f2.8, Pergear 35mm f1.4. Voigtlander 35mm f2.5 and TTArtisan 50mm f2.
If I could find a nice tiny 28mm I'd buy it

There's a 7Artisan f1.4 which gets good reviews and you can buy one in M mount but optimised for Sony. it's a shame they don't put a Sony mount on it, but it isn't tiny. The smallest 28mm I can do at the mo is my Olympus Zuiko f2.8 with adapter.
Pergear at f1.4.
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