The 24mm TS-E L has been a HUGE disappointment for me. 24mm is "my" focal length - I also shoot with the fabulous 24mm f/1.4 L Mk II, and the 24-70mm f/2.8 L. But the TS-E was shockingly soft. I am not the kind of photographer who spends hours pixelpeeping, but I bought this lens to shoot urban landscapes to print large, and the mush around dense tree branches was unacceptable. No amounts of carefully applied sharpening from Nik Sharpener could save the image. I was able to reshoot the same with the 24mm Mk II and the images were great in terms of sharpness... but compositionally different due to the absence of shift. (Body is the 1Ds Mk III)
I hope Canon introduces a new TS-E L lens, or just a Mk II.