Here's the 35mm XL shifted just below 10mm on my IQ4 with CF to give you a sense of magenta on BSI; if you don't LCC you will have some strong magenta at the top, subtle everywhere else, so IMHO it is a must to LCC if you go below 40mm. Even at the centre you have magenta color casts. Its everywhere because of the optics being so close to the sensor.
On non BSI this is deep magenta which you cannot remove anymore. Here you see at the bottom also discolorations, but they go away with LCC.
Color cast is stronger than on 43.
The CFV 100c will be smaller so it will take just more mm shift to get to the really strong cast levels at the top, so because of that they will seem more useable. But color cast remains everywhere with the sub 40mm SK UWAs due to the angle at which these lenses project onto the sensor plane and this as a result needs to be managed actively by the photographer.
For some this is a HUGE pain, espcially if they come from 35mm where this is an unknown problem, for some THIS IS NOT and just part of a slow way of shooting,.
So: You will need to LCC ... on BSI backs except if you want some subtle magenta all over the image. This means for best results in the field you need to bring the little white plate and make sure you capture correction shots for your specific shift and aperture scenario.
This is why Rodie won the tech cam lens wars, but for the discerning architectural photographers the LCC process is ok.
28 and 35 XL have stronger casts, 43, 60 XL much less so. Because the IC of the 43 is so large you can go from low cast to sensor tiling issues if you go full crazy with shifting, e.g. 20mm+ on a very wide angle lens ...
That's why also the 43 and 60 XL are so sought after - they balance huge ICs, manageable color cast and rectiniliearty for a natural look into a tiny package. 35 and 28 require more careful shooting. Also remember that 43, 60, 28 XL came years after the 35 XL and are therefore more advanced designs with larger useable ICs. The 28 XL, for those who have seen one, is extremely sharp at the centre, really pushing the limits of what's optically possible.
If you can, the lens to get is the 43 IMHO as it is very sharp, less colour cast than 35 XL and has the largest IC available for a very wide angle lens. On the CFV100c this one will be formidable (the others too, but just require LCCing). Except for the FoV, its literally a better featured lens on all levels. Hence one is 1.5k, the other one 7-10k.
The benefit of the CFV100c is that it ALLOWS you to use SK glass in the first place ... which you want for the IC, compactness and low distortion which leads to a natural look in architectural photography.
43, 60, done.
View attachment 210118