What I wanna know is, can you really hear the differences in these amps or is it all in your head? :^) If you really want to get to the bottom of things, you'll have to blindfold yourself, and everyone within 3 blocks and put earmuffs on, and twirl around 3 times while chanting, "I do believe in science, I do believe in science......". :^)
Now, really, what makes you think that the "big boys" you mention actually ever made anything close to the best amps, ever? Perhaps now you are just finding out what you didn't realize before.
My guess is that the smaller and newer manufacturers must make a product that is head-and-shoulders better than the mass market high-end that dominates the magazines, to even get noticed.