I don't know if the usual sharp in the centre, soft on the outside scenario will work for a 24mm wide tilt shift. That is certainly not the case with the Canon 24 TS-E. Some may think that if that level of IQ is acceptable, why not just go for a Lensbaby.

I have been looking at that new Sweet35 Lensbaby, it looks like a very creative and usable lens.

I would like Canon to update their 45mm TS-E to L specs as well.

Time will tell.