I'd stick with Canon as I know their system already.
Canon 5D Mark III
24-70 F2.8L II
Gitzo GT2531 + Manfrotto 468MGRC2
I'd would not purchase the 16-35 F2.8 II again as I don't shoot super wide all the time, but it was very useful on my crop sensor at the time. I'd start with the above then either get some studio lights or 70-200 F2.8L II.