Did you remember to remap Alt-F2 for Krunner (which looks nothing like on XP...) to Win-R?
Did you fix the Lock Screen to look exactly like XP?
I can tell you as a KDE dev myself that although you can do amazing things regarding look-n-feel, there is still a big difference. Even on things that are not very different between the two, that simply becomes an "uncanny valley".
Did you remember to remap Alt-F2 for Krunner (which looks nothing like on XP...) to Win-R?
Did you fix the Lock Screen to look exactly like XP?
I can tell you as a KDE dev myself that although you can do amazing things regarding look-n-feel, there is still a big difference. Even on things that are not very different between the two, that simply becomes an "uncanny valley".