NT4 was reasonably rarer due to hardware compatibility issues as well as software compatibility. Windows 2000 brought great change there, but it only really finished with the very soon after XP.
The organizations that really needed NT for various reasons (engineering software, SMP, higher security settings, etc.) did move as early as NT4, indeed. Also, non-trivial amount of Alpha workstations with NT4 (as well as Pentium Pro ones)
I guess it depends on the office though. At risk of stating the obvious: Different organisations will do things differently.