Yeah it's sort of a continuum, between 85 and 92 the Amiga had clear advantages over other systems, in 85 it was a world beater, in 92 it was still ahead in a number of areas, from 92 to 95 was the real transition from competitor to also ran.
Commodore wasn't willing or able to put enough money into the Amiga to maintain the lead it had in 85. Somehow they didn't understand that once you move out in front and make yourself a target you have to keep moving, others will be interested in your market and they *will* be spending money to catch you.