Robert, as Dan pointed out, if you transfer them properly, the sound can be audibly identical to that you now have playing the CDs on your player. One of the outputs(computer compared to player)may be slightly different, and if the sound level of one is slightly higher, you could get the misimpression that it's better rather than just being a little louder, which is corrected with a slight volume increase on the receiver.
To clarify a point, if your receiver presently has an input for the output from the USB, then it has a DAC for converting that output, and of course you don't have to buy one.
