2.8 IS II is fantastic, and if your budget can afford it, i would say get that, never look back and enjoy your images!
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Using the 24-105 at the wide end using manual focusing for landscapes/architecture is also a good idea. Drop the ISO down to 100 to maximize DR/sharpness and stop down the aperture to f/11 or f1/16 to maximize DOF. If you are ok using this workflow for landscapes and architecture, then the TS-E will be a great addition for you.
This made me realize that even $399 was too much for it.
Now, the 35/2 IS for $399 would have been another story...
Optically it appears to be a very good lens. If the offer had been in the UK I would have been reaching for my credit card.