Just received the 5XB Nylon and it was the right choice. Perfect fit for XT2, 23/35/50 lenses. XPRO2 with same lenses fits as well. The only slight disappointment was the lack of any cushioning on the sides. Easily remedied with a couple of Domke dividers that fit perfectly.
I can also imagine it holding 2 fast primes and the camera body with a third prime, outside the bag.