Anybody using the Sony/Zeiss FE 55mm lens yet?
DXO testing shows results very close to the Otus 55 mm, in fact second best for any lens behind Otus and the best audiofocus lens DXO has every tested. I should receive one soon along with A7R; I just hope all the ergonomic issues, Sony-specific software/hardware issues don't make me regret buying that combo to use alongside my 5D III.
I have no idea how it compares to an Otus in real life and probably never will (unless I rent one for kicks), I've not owned mine for very long, and so far I've only used it hand-held, but I'm finding the sharpness, clarity, contrast, colors etc. on my A7r to be quite remarkable, even on fairly distant subjects, whether in bright sun or at night, and at all the apertures I've used so far (it's impressive at 1.8 but does improve a bit with stopping down). Excellent bokeh too. I can't agree with those reviewers who have said they don't ever see any chromatic aberrations - while its performance may well be better than that of most fast lenses, I certainly see it in the usual worst-case high-contrast scenarios, but it's easy enough to fix in, say, LR; and while the files respond very nicely to tweaking, the RAW files look pretty damn good viewed 1:1 in LR with no more than its default import settings. (I've also seen a bit of shutter shock on a couple of photos where I wasn't paying attention and the camera selected the shutter speeds where that happens (1/100-1/125 or so).) It perhaps goes without saying that it's considerably better than the 28-70mm kit zoom.
I suppose it would be nice if it had IS (or OS or whatever Sony calls it), though I've not had a problem resulting from its absence so far (and it wouldn't help the shutter shock anyway, would it?), but given how well it does I'm disinclined to think it's overpriced for what it is. (Then again, I was able to take advantage of the current promotion and bought it with the camera for $200 off....)
I also suspect that, as a practical matter, it's easy to exaggerate how good this lens is. Yes, this lens/body combination captures remarkable detail etc., remarkably well - but I've also obtained excellent results from several of the Canon lenses I've tried on the camera too, including such bargains as the 40mm pancake and 85mm 1.8 (though this isn't as good at 1.8 as the new Sony is). In many situations, especially if you're not viewing the images 1:1 or making huge prints, there may not be much of a difference in image quality (though of course you'll get much faster focusing from the Sony lens).
Anyway, there seems a pretty good chance you'll be pleased with it - I hope so!