Using Canon lenses on FS7

[Piotr Wozniacki]

Guys, I'm reviving this old thread to ask for some advise and clarification. WIth my new FS7 I have the kit 28-135 lens, and find it a solid lens with its hard-stop rings, both fully servo and fully manual (especially the forth and apt moving focus ring reminds me of my EX1 lens, and in the good sense, too). But it's what it is - sometimes not wide enough, and sometimes not fast enough. So I'm also thinking of buying another zoom, but please forgive my noob question (I know nothing of Metabones, or Canon EF/EF-S lenses): am I correct the following combos will both work on the FS7:

- Canon 24-105 F4 with Metabones Speedboster Ultra
or
- Canon 17-55 F2.8 with Metabones Mark IV

Which is considered "better" on the FS7? Also, speaking of wide primes, what the opinion is of:

- SAMYANG 16 mm T2,2 ED AS UMC VDSLR CS Sony E-mount?

Or to go even wider:

- SAMYANG 14 mm T3.1 ED AS IF UMC VDSLR MANUAL Sony E-mount?

Thanks for comments/clarifications,

Piotr