Here are some comparison pics:
Darkside trooper boots (size 12) on the left, TKboots (12) middle, painted chelseas (12) (johnson and Murphy's) on the right.
I wore them for several hours around work. They fit well to me. I wear a 12 or 12.5 in most shoes. The TKboot 12 fits well. I would say the width is normal, certainly not wide but NOT narrow. The Darkside are definitely wider.