Probably down the scale from your consideration, but I had the same experience with my equipment. Using a Rogue Audio RP-7 preamplifier (tubes) with a highly-regarded tube power amplifier that replaced a Benchmark AHB2 driving my Fyne Sudio F-702s, I concluded that the switch resulted in lost definition, some imaging degradation, and inaccurate tonal qualities of instruments. After extensive research, I replaced the tube power with two Odyssey monobloc amps, extensively upgraded Stratos amps, almost Kismets. WOW! I now had back all that I felt I had lost in terms of those three considerations. The clarity is superb, instrument location is quite good—expanded both in depth and laterally, and the tonal qualities of the musical instruments are excellent; and there were improvements in bass reproduction, although I am still researching gradual upgrades, including from my older Definitive Technology Supercube 6000 subwoofer (perhaps the Paradigm XR11), as well as a new DAC (maybe anYggdrasil MIB?) and streamer upgrades (likely an Innuous Zen MK3). I realize that there are system far better than mine, but I am quite pleased with the musical qualities I am getting with my system.
So, yes, the change brought more detail and improved sound quality … without “breaking the bank.”