We have added a very-interesting MTF chart comparison to the Canon EF 85mm f/1.4L IS USM Lens page (scroll down to the image quality section).
These charts give us some indication as to how the new 85 f/1.4L IS lens' image quality stacks up to several other lenses, including the Canon EF 85mm f/1.2L II USM Lens, Canon EF 85mm f/1.8 USM Lens, Sigma 85mm f/1.4 Art Lens and more.
Update: Please note that I have corrected a mistake in the Sigma chart interpretation.
The demand for this Canon lens is very high - preorder early to be assured of the earliest acquisition (perhaps it could be an early Christmas present to yourself)!
The Canon EF 85mm f/1.4L IS USM Lens is available for preorder at B&H | Amazon | Adorama | WEX.