Surprisingly, yes I have, my brother has the 17-50.
I still prefer the 10-24 plus 28-135 combo. the extra 7mm on the wide end really makes a difference while the missing 4mm isnt really noticeable.
fair enough - tis personal preference I guess
though youre likely in a minority - 24-70 and 70-200 are popular combinations on full frame (1D, 5D)
the 17-50 f2.8 from sigma and tamron and 17-55 f2.8 from canon have effectively been made as a (rough) equivalent and indeed the 50-150 f2.8 lenses - though tbh.. you might as well use a 70-200
I think Id be changing lenses too often with 10-24 and 28-135
given that binary has already got a 70-200 then ditching the 28-135 is a bit of a no-brainer IMO