I, too, fully concur with Actuary's comparisons #1-10 except #3. IMO, I believe the CS3.7 wins in the bass department. I've auditioned Sasha while I was still deciding on what speakers to purchase and the bass I heard didn't come anywhere near the bass extension of the CS3.7...which was surprising.
I haven't heard either, but Wes Phillips stated this about the bass in the Stereophile review:
Choose not alone a mate
I briefly auditioned the Thiels while the Avalon Indras that I reviewed in October were still here. The two speakers were essentially cut from the same cloth—both had startling clarity and detail without the in-your-face quality usually implied by "detail." Like the Thiels, the Indras lack a sock-'em bottom end. Of course, the difference in price could buy the Thiels a pretty good subwoofer system. But shipping schedules kept the Indra/Thiel comparison brief, so I trotted out the trusty Wilson Audio WATT/Puppy 8 system, because it's such a known reference point for a compact high-quality monitor.
The title track of the Dave Holland Quartet's Conference of the Birds (CD, ECM 1027) perfectly illustrated one of the W/P8's greatest strengths: The speaker propels music forward through its bottom-end impact. With Holland's big acoustic bass setting the pace, the piece loped along splendidly, with Sam Rivers and Anthony Braxton chattering away on flutes and soprano saxophones (switching from one to the other as required), while Barry Altschul supplemented the sound as needed with trap set, chimes, gongs, and marimba. The Thiels did a good job of delivering all that harmonic complexity, but the Wilsons had the nod in the slam department—which also means they had better pace.