How would I test it without owning the lens? I'm not in a good place where I can rent lenses, so I'm not trying to be snarky either but I was just looking for an opinion from someone who is experienced with shooting with two different lens manufacturers, on the same film.. But you are right, there are probably a lot more variables, I was just wondering if it was a big problem right out of the gate using these two lenses together. Maybe someone who has experience with these two lenses. Thank you!