Need some advice re Canon fullframe ultra wide angle

I am buying a new camera system and have my bases pretty well covered apart from the wide angle end.
Body will be a 5D mark ii.
I have 24mm covered but it’s really the ultra wide I am interested in opinions on.
I don’t want fisheye.
What would be your advice for wider than 18mm?
I want something that I can run a Lee filter system on the front of.
I want it as sharp as I can get with as little CA etc as possible.
At this stage I’m considering the Canons 16-35ii F2.8 or the 17-40 F4.
Is there a prime that is better than them or something exotic that I am not aware of?
Any opinions welcome.
Also interested in anyone who has used teles with ultrawides and how it works (or doesn’t work).

regards
Garth

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