Those CDs can indeed be very good, but not all of them used the best sources available (=the earliest available generation master tapes). Sometimes modern CDs are the best option - e.g. the Beatles In Mono box is great and completely uncompressed. The mono releases are for most Beatles records the mixes the band themselves participated in making. Someone else then remixed them to stereo.
Modern vinyl releases, even when not compressed, usually come with some amount of bass boost. I don't understand why there is this need to modernise the sound of vintage recordings. It's not like blu-ray releases of black and white movies are artificially coloured either.