Angle of view comparison: WWL-C and 16-50Z, with Sigma 8-16, Nauticam 8.5" dome.

Just FYI only. Today I compared the Nauticam WWL-C and 16-50 Z lens with the Sigma 8-16 on the FTZ adapter, with the 8.5" dome and 50mm port extension. (I had the Sigma lens tweaked by Sigma in Bangkok so the AF would work with the Nikon Z50. Cost about 35 GBP.) The 8-16 is the wider view, from the same vantage point. Both on the Nikon Z50.

And here is the Tokina 10-17 from the same vantage point: Nikon Z50, FTZ, 8.5" Nauticam dome with 20mm extension and 85-120 adaptor.