That is a difficult question. Neither is 100% perfect, but if you get both set up correctly, both will give entirely acceptable results. A lot of people don't get them set up correctly. I don't think I have reached the optimum on the D700 with the 17-35mm, but if and when I buy a camera, I will experiment in detail and share my findings.
I also think that the pop-up flash/optical TTL option on the Subal D700 would be useful. I should have mentioned the lack of it in my review. The downside of it is that it limits you to using Japanese strobes which all have colour temperatures above 5400K.
Alex - Have you had a chance to experiment with 14-24 on any full frame camera/housing combination yet? I've seen a few posts with images but nothing from a controlled, scientific perspective meant to test corner performance and comparative angle of view.
The comparison of optimal achievable image quality from 14-24 vs. 17-35 (both on full frame) vs. 12-24 (on cropped sensor) would be very enlightening, especially with a Tokina 10-17 thrown in there on cropped sensor just to demonstrate yet another option.
I'd do the test but I shoot Canon, and therefore don't have any of the necessary cameras and lenses and housings. Is there some Nikon shooter out there willing to take on the task?
Edited by StephenFrink, 23 November 2008 - 06:24 AM.