"I'd say in most respects the Cosina-made Zeiss lenses are the best of the current bunch"
Hye Telecaster.
Long time no see!
I do agree that the Cosina manufactured lenses are superb. My point being that simply, they are very different. I know that those lenses are manufactured and designed to fit a specific brief [as where the SL I line of Voightlander branded lenses, where the ApoLanthar was my fav.].
The only thing I wanted to stress is that, as I grow older [you know, that condition that happens to cure as time passes], I don´t have the time to dig around for too many options. I´m loosing the geeky side of having too much gear. Hence, I get lost with all the Canon and Nikon lens lines: too deep to dig about. I´d rather have a line [max. two lines] of affordable+the best optics. That way, I don´t have to get lost.
With these options [the Sony G lenses, which are very good lenses as well, Sony-Zeiss lenses, the Minolta legacy, the Zeiss branded lenses [the three lines of them so far], and the Cosina lenses], I surely am lost. Too many options to do the job, I´m afraid.
Answering what I would ask to Sony on those lenses, that would be:
-Size reduction: Take the lens to the gym, and have it lean. Not tiny, just lean. The KA 77 Ltd is 1.8, and it is considerably smaller. Taken that it has much less electronics embedded [no AF motor within, no readouts], it is physically just half a lens. With a small camera such as the A7 family, that should be a bonus.
-The built in shade.
-Krinkled finish: Funny, but all the Zeiss glass I have used has the tendency to be a bit slippery. Not bad per se, but not handy when on duty.
-Improve the color rendition of the lens: I don´t know why exactly, but colors do not look right on the samples I downloaded. They have the tendency to have the effect of a recovered HDR image.