I think that Canon FD lens you have is very similar to my Vivitar, 24mm f2.8. They both seem to produce very sharp images as yours look the same as mine for image quality etc. I must admit that 24mm is spot on for me too and the Vivitar is an absolute joy to use, so much so I'm kinda hard pressed to see why i would need the Zeiss when it comes out. We would be spending hundreds of $ or £ just for AF when the NEX has a brilliant MF assist function that is quick and easy to use. I can't see the Zeiss being that much better for IQ either as our lenses are SO good. OK the Zeiss will be a bit faster but again you have to weigh up the $ for function. When it arrives I'm going to ask if i can take it home for the weekend and give it a good try out. If I feel it's worth paying out for then I'll get one, If there's not much difference then I'll stick with the Vivitar.I've been using a Canon FD 24mm 2.8.
I'll tell ya, it's got me right in the FOV pocket that I see.
It's a great lens with the Nex.
I just did around 300 images at Gettysburg and that is the only lens used. Sure I'd love the Zeiss but I can wait..... Actually, I'm happy with this setup and don't care about anything else..
for the moment....