On e you have an iPod that will work with your dock you should be very close to CD capability. If you had a CD player that also had a digital input you would, in theory, be using the same DAC with different transports. I don't know how much difference there would be between your lossless iPod files and Redbook CD, but it should be negligible for anyone willing to use an iPod in the first place (not intending any judgement with this statement just suggesting that using an iPod is likely an indicator that your gear isn't likely the elite extreme high end). I don't know if I could tell a difference in my system or not.
I have heard computer audio that I preferred to the $30k Clear Audio turntable that had been playing seconds earlier and I have also preferred a similar turntable over CD in a direct A to B comparison. Bottom line is that CD, computer audio, and vinyl can all be great!
I have heard computer audio that I preferred to the $30k Clear Audio turntable that had been playing seconds earlier and I have also preferred a similar turntable over CD in a direct A to B comparison. Bottom line is that CD, computer audio, and vinyl can all be great!