if you are looking for a 'filmic' look, a problem with hd in general is that it's often too sharp and determined.
therefore always looking to use 'older' and softening lenses for film like imagery. preferably produced before the 70ties.
Wow! I was sure I was only idiot who thought the same way))
I was working in small production and one director told me that the problem was not in lanses but in light (picture was toooooo sharp). We were arguing for an hour and decided to test some combinations. We'll do it.
although i like most of the canon lens range a lot, even the zooms which are great in their field, in general for a more filmic look the imagery is rather sharp most of the time. colors blend less than with exposure on film.
Canon lens are good for no art movies, I think. Or you should know how to use aperture right. Or how to change aperture and shutter speed at the same time and without step-effect.
Yes! This is the only way to cinema.
and then you can be lucky in russia finding those kind of 'home' made obscure lenses with a nice drop in depth of field.
I have two soviet lenses, Gelios 44m & Industar 61 L/Z and Meyer-Optik Görlitz Orestor 135 mm f/ 2.8 («Bokeh King»); will show you how it works on 5D Mark III.