I haven't tried the Schneider. But I do have all three Canon TS-E lenses, and two of the 35 T/S lenses, one in original mount, and one converted to EF. They are all fine lenses, and for shooting landscapes they open up creative options that you simply don't have with other 35mm format lenses.
With other lenses, you're limited to using wide angles lenses for landscapes, because otherwise you can't get enough depth of field to get the entire image in sharp focus. And even with very wide lenses, you're still limited in how large you can print, as the circles of confusion can't be small enough.
With the ability to tilt, you can get a greater range of distances in focus with a 90mm lens than you can with a regular 24mm lens, because you can get the entire surface of the ground (within reason) into sharp focus, and you're only using depth of field to get tree tops and clouds into focus. It's amazing how liberating these lenses are.
Most 35mm shooters would never think of a 90mm lens being suitable for landscapes. But the 90MM TS-E is! So is the 24, and for the same reason.
And why even ask what the maximum aperture is, except as a focusing aid? For landscapes you'll be using a tripod. You'll never be shooting at maximum aperture, since there's always a reason to stop down for landscape shooting, even if only for the higher resolution most lenses deliver at f/8. Don't forget your tripod! ;-)