Don't think of the wireless as inducing jitter--the wireless is 802.11, which should be packet-based protocol. That means that the data is being reclocked for output in the Airport, since PCM over toslink or coax is a stream. The reclocking is where the "jitter" is going to be introduced--if the data rate of the AP is insufficient, the stream is going to be interrupted and your DAC will have to relock, so defects there should be like falling off a cliff--its either coming through or its not. At least that is my guess.
The issue of whether its as good is going to be how well the CD transport you compare it to does at limiting jitter compared to the AP reclocking. Since the transport is also reading real time, the comparison may also run to how good the error correction in the transport is. The analogy on the wireless side is how well you have ripped the CD data and whether what is on your hard drive is a bit-perfect copy of what was on the CD. The jitter issue is going to be also impacted by how well your DAC deals with jitter. Some are better than others. Anyone who advertises a DAC that "eliminates" jitter is pretty much full of it.
The issue of whether its as good is going to be how well the CD transport you compare it to does at limiting jitter compared to the AP reclocking. Since the transport is also reading real time, the comparison may also run to how good the error correction in the transport is. The analogy on the wireless side is how well you have ripped the CD data and whether what is on your hard drive is a bit-perfect copy of what was on the CD. The jitter issue is going to be also impacted by how well your DAC deals with jitter. Some are better than others. Anyone who advertises a DAC that "eliminates" jitter is pretty much full of it.