Does anyone out there NOT hear a difference in CD

I'm using a classe ca 300 power-amp and a Rogue Metis tube pre-amp. I also have Usher 6371 floorstanding speakers.

I'm guessing the Cambridge would only be marginally better than my old PD-65. Probably not worth spending the $1600 on it.

Maybe the Benchmark DAC I've been seeing some write-ups on would be a better decision.

I have no issues with the PD-65, in fact I am the happiest I've ever been with my system. I was just considering replacement due to the age of the Pioneer and also, I've been told digital technology has advanced so much since that player has come out that it a new cd player would sound much better. I have to say, the Pioneer is built like a tank and the transport is dead quiet while playing. I've heard some new machines in excess of $1000 that aren't as quiet as the PD-65. Also, when I first bought the PD-65 back in the early 90's I also purchased a Theta external D/A converter. I returned it because I could hear absolutely no difference in the sound. I have been a little skeptical of external D/A converters ever since.

From what I read, a new player, especially one that costs $1600 (Cambridge 840c) and is an "upsampling" machine should sound considerably better than one from 1992 that cost $800. That is the year my pioneer elite was manufactured and it retailed for $800. If it doesnt' sound better, what is all the talk of advancements in digital technology? It makes me wonder if there really has been any significant improvements in digital sound? Maybe I should just keep the Elite until it stops working and forget about it.