A XCD 2.5/135mm V lens would be nice.
What is wrong with the current one?
The Af could be faster and more precise.
AF precision of all my 6 XCD lenses is perfect with a 100% hit rate
With my XCD135 with or without 1.7x extender on the 50Mpix
x1D with subjects distant more than 1km il's for example possible by trusting AF to
read inscriptions on cars.
XCD120 and 135 have an AF distance range selector to increase the focus search speed.
Focusing at infinity with full range selected and starting on near focus limit is just a photographer's error, not a gear problem.
a 2.5 135 would be a quite large and heavy lens, just by the necessary lens diameter