Ime, the higher you go up in price doesn't necessarily guarantee that you could experience the above mentioned. It seems to come down to the nitty gritty of the circuits under consideration, i.e., the black art of power delivery and analog circuit design.
@deep_333 High end audio, like many high end products, is driven by intention rather than cost. So you can run into less expensive gear that easily seems to outperform equipment that cost several times more. This can happen because the less expensive gear is built to a price formula rather than what the market will bear.
There are now class D amps that are exactly that- smooth, detailed and involving- that can easily outperform (and sound better than) amps that cost quite a lot more. Of course, not all class D amps sound the same just as not all class A amps sound the same so you should not be dissuaded if the particular class D amp you encountered didn't seem to bring home the bacon.