Color correction,CA, sharpness (i sharpened them equally). Well most things u usually edit. I have tried to make them as equal as possible. And as you can see, they dont differ much at all.
I got some feedback on flickr from a reader! (Yes apparently i atleast got one reader! or perhaps visitor is the correct term 🙂 ) It seems i have given the impression that the 17.5mm is not an awesome lens. And that was never my intention, nor is it the case!
The Nokton 17.5mm f0.95 is totally awesome! Sure it has CA, but so does everylens… if you pixelpeep these 2 images, the 42.5 is slightly sharper, now when cropped and sharpend, you cant tell them apart. The only apparent differens is the FOV (and some contrast on her face, the sun peeped out when i was shooting with the 42.5).
And that is almost all the diffrence there is. BUT the 42.5mm is to my eyes, sharper,has less CA and less distortion. When compared.
At the end of the day. Its not much to whine about, or perhaps nothing at all to whine about. The difference between the 17.5 and the 25 is alot bigger i think, but that is alot of guess work on my part, i have just shot a few pics with the 25. I think Sharpness is towards the low end of what is acceptable. (as far as i could tell from the little i used it) And by that i sharpness @ the biggest aperture. Stopped down they are pretty much flawless, that goes for the 25mm to i guess.
Hope this straighten things out!