+Some need a filter to be sealed and since there has been some less than acurate info shared here let me share the list I got from Canon, Japan:
And a note on which of these that need a filter to be fully sealed (The Super Tele Lenses are not included in the list below):
[...]
EF 85mm 1.2L II USM
[...]
There are many weather sealed lenses that are omitted from your list, besides just the superteles. The 85mm f/1.2L II is on your list, and it's not weather sealed.
Sorry, your list is incomplete and is actually adding to the inaccurate info being shared here.
–1
The 85L 1.2 II is somewhat difficult to decide in weathersealing. It has no sealing on the bayonett but it's known to be quite weathersealed if you attach a frontfilter. The Body itself is well sealed.
LOL.

First off, there's nothing difficult to decide. If your car has one window broken out, the interior will get wet if it rains...even if all the other windows seal up tight. The lack of a mount gasket on the 85/1.2L II means the lens is not weather sealed. Period.
As for your statements that, "
...it's known to be quite weathersealed," and, "
The body itself is well sealed," known by whom? You? The wisdom of the internet? Can you provide some evidence to back up your claim? It's always amusing when people make bold claims like this, and it turns out they're just spewing BS from their nether orifice. Not your first time,
evidently.
As you're frantically scouring the internet for some authoritative source to back up your BS, here are some statements from a previous email exchange with Canon USA's technical advisor for you to consider (emphasis mine):
Pre-1999 white EF lenses such as the 200/1.8L, 300/2.8L, 300/4L, 300/4L IS, 400/2.8L, 400/5.6L, 500/4.5L, 600/4L, 35-350/3.5-5.6L, 70-200/2.8L, and 100-400/4.5-5.6L all lack mount gaskets but have moderate dust and moisture resistance for their switches, focusing rings and zoom rings where applicable. Other pre-1999 L lenses like the original EF14/2.8L, 24/1.4L, 35/1.4L, 85/1.2L, 135/2L, 200/2.8L, 200/2.8L II, original TS-E lenses, etc. have no special seals or gaskets, but they are sturdier, generally speaking, than most non-L lenses. Under no conditions does an EF lens without a mount gasket resist moisture at the lens mount as well as a lens with a built-in mount gasket.
There is no difference in the mechanical construction of the EF 85mm f/1.2L II USM lens compared to its predecessor. Therefore, the comments that you quoted from my [previous] message remain applicable to this lens.
Best of luck in your Googling.
