I consider the Oppo 105's CD playback to be very good thanks to its overbuilt power supply with large toroidal transformer, separate and isolated CD playback circuitry and excellent Sabre 9018 and 9028 dac chips usually found in much more expensive players.
I believe its CD playback performance would fair very well in comparisons to a wide variety of CD only players from a wide variety of price points.
However, I think it's important to point out a few facts that readers of this thread should keep in mind, especially when comparisons are made to components that are much less versatile such as the Rega Apollo CD player which can only playback redbook CDs.
The Oppo 105 and the current 205 are 'virtual Swiss army knives'. They are both primarily high quality Blu-ray players with impressive video processors, HDMI connectivity and surround sound processors with up to 7.1 channel decoding to analog audio outputs. They both are able to play back virtually any silver disc: CDS, SACDs, DVDs, DVD-As and even CD-Rs. They both can be used to stream high resolution audio files (up to and including DSD) either via hard-wire or wireless connections through their very good internal Sabre dacs. External hard drive storage units can be connected to store ripped CDs and downloaded hi-res music files.
Just something to keep in mind when comparisons between these Oppos and less versatile players are made. Others may dismiss this extreme versatility with comments such as "Jack of all trades, but master of none".
After using the Oppo 105 for about 2 years, however, the original unshortened quote seems more appropriate to me:
“A jack of all trades is a master of none, but oftentimes better than a master of one.”
Tim