If it helps - here is a gallery of some of the images I have taken this year with the D700. If you run the slide show - the file names (put mouse over pictures) will show you what lenses I used for the various photos:
So far I have shot the Sigma 15mm fisheye and Nikon 16mm fisheye, occasionally with a 1.5x teleconverter fitted, Nikon 17-35mm with +3 and +4 dioptres, Nikon 20mm with +4 dioptre, Sigma 28-70mm with +3 and +4 dioptres, Nikon 60mm AFS, Nikon 105mm AFS VR and Sigma 150mm macro lens. I used the Nikon 5T and Canon 500D dioptres, sometimes stacked together.
Alex, I am curious about your take on the Nikon 16mm FE versus the Sigma 15mm FE. I've only used the Sigma on land, so I cannot really speak to the Sigma for underwater use. I migrated from a DX body a couple of years ago and loved my Nikon 10.5mm FE, but I don't think my shots are as crisp with the 16mm.