Since I own both the CM1 and Studio 10, I'll put in my two cents.
I use the Studio 10 for my TV system, and the CM1 as part of my HT system.
I find the treble quality of the Studio 10 a bit too bright overall, which does grate on me for long listening sessions. The CM1 has a more natural treble quality which I can listen to for longer but it tends to dull the sharpness of high hats and cymbals just
a little bit, so I find it useful for harsh recordings that are all too common these days. For the bass quality, both have very tight bass, but the slight bit of midbass hump for the CM1 works to its advantage when you are running them without a sub which helps balance off the rest of the spectrum in a larger room. With the Paradigms, they sounded a bit thin overall until I paired them with a sub and even then I find it sometimes is missing a realistic weight in the vocals. If I use some top quality recordings, the Studio 10 tends to emphasize the natural sibilance a bit more than I think is realistic, but the Studio 10 tends to reveal detail better just because it sounds a bit more forward overall.
I'll leave it up to you to hear them for yourself, but I'd say they are very different sounding speakers. If you already like the Studio 10 in auditions, I think you'll find the CM1 sounding kind of dull in comparison. In my own room, the CM1 works better for me.
The only other thing about the Paradigms that turned me off is that they were sloppily assembled. My first pair was defective and my second pair has cosmetic defects that don't affect the sound but make me wonder if every workday at Paradigm was a Friday.
And I almost forgot, I saw your recent post and I would not actually recommend either in the room you have. My CM1 works ok in my 18x14 room with a large ported sub crossed over at 80Hz (the ideal crossover for this speakers) but any larger than that, you need to step up to the CM5 or Studio 20. As well, the Ultracube 10 is only really suitable for small room, it doesn't offer the extension or output to do justice to your open area room. I'd buy an Ultracube for my computer system or den, but for your size room, you should really consider Paradigm's larger subs or go for something completely different (SVS makes the $700 SB12 which is better sounding, and is comparable to the Ultracube 12 in output )
One speaker you should also consider is the NHT Classic 3. It's better than the Studio 10/20 IMO. I found it worked well for my room, a listenable sound that was not fatiguing for long sessions. There are a couple of things that I liked about the CM1 more which is why I sold the C3 and kept the CM1, but now that they reduce the price and sell direct, it's a great deal. It's just a very solid performer and I recommend it to everyone.