Yes, you're right. The 17 TS-E is pretty much without peers at its focal length. But to call my post misleading is wrong - I did end the post by saying that the most important factor isn't sharpness, but choosing the right focal length for your application - which you conveniently missed out of your quote....The 17 TS-E isn't all that sharp wide open, and doesn't respond too well to TC's. Even stopped down to f11 with the 1.4x TC, its nowhere near as sharp as the 24 TS-E II is wide open:
In comparison to the 24mm the 17mm is slightly less sharp, however, the 17mm TS-E is widely considered to be one of the best ultra-wide lenses of all time and easily out-resolves any Canon or Nikon UWA zoom or prime. So your comment is very misleading. Both lenses are among the very best in there respective focal lengths, and what should be discussed is whether a wide angle or UWA FL is needed. The ability of the 17mm to act as a 24mm TS with the TC is just a perk, if 24mm is the FL that is needed, then the obvious choice is the 24mm II.
Fair enough, I didn't include your entire post in my quote, however, this part of your comment is factually incorrect:
The 17 TS-E isn't all that sharp wide open