Thanks for these very interesting exchanges about the 19mm tilt-shift. I've had the 35mm PC in the 1980s, I have the 24mm now and I'm hugely bothered by the fact that I have to choose between tilt and shift on the same axis, or on different axes, with mandatory pit stop at Nikon Service in between. The 19 would be a huge improvement over this, not to mention the new shift mechanism which looks like a big improvement over that in the 24.
So, I'm seriously contemplating this 19mm, but there isn't a lot available online in terms of reviews and I was glad to find firsthand account on LL. What I have read here reinforces my interest for this lens. I already own the 14~24, the 24/1.4 and the Zeiss 15/2.8, but nothing replaces a good tilt-shift for architecture.
Thanks again for your help, and if another LL member also owns this lens already, let them contribute their input to this thread, thanks in advance.