I pretty much exclusively use the 50mm f2 WR on my X-T2 as its my preferred focal length (and is an insanely good lens) but it’s considered too long for most people as a walk-about.
The wider f2 primes (23 & 35mm) are equally as optically strong and are more useable for general purpose.
Hah - I should have been more specific. I've got the 35mm F2 (50mm equivalent from memory) but wanted a better range of focal lengths without having to carry multiple lenses. Probably asking too much.
That’s a loaded question!
I pretty much exclusively use the 50mm f2 WR on my X-T2 as its my preferred focal length (and is an insanely good lens) but it’s considered too long for most people as a walk-about.
The wider f2 primes (23 & 35mm) are equally as optically strong and are more useable for general purpose.
I also have an X100 and really enjoy it's 23mm.
Tl;dr 23 or 35 primes