@audio-union,
There is a reason why all the really high performing CD players and transports do not play SACDs. There a compromise made in doing so. If you do a side by side on an adequate system it stick out like a sore thumb. Anything that will play them all is going to be noisier and have more jitter by design
I believethat you are definitely on to something here. It seems that when audio manufacturers are after the best Redbook CD playback they can manage, they choose to go exclusively CD only. No DVD, SACD, Blue Ray etc. Dedicate all energy and resources to getting the most from CD only.
It seems that this single focused approach (Rather than jack of all trades) very likely yields the best sound quality result. The Pro-Ject CD Box RS2 transport has been mentioned in this thread. I own one and the sound quality is superb! It's very difficult to bring a listening session to a close for the night.
Small/compact form factor design? Yes. Big performance envelop? Yes. Front panel buttons are small, however the supplied remote control can be used if desired for "all" operating functions. Paired with a good quality DAC and you'll have a first rate digital front end if you enjoy playing CDs.
Charles