African safari 5D mk1 + 5D mk2 or 7D?

Hi all,

I'm planning a Safari to Tanzânia or kenya to mid May.

I have a 5D (mk1) and An old 350d.

My lens are:

100-400 L
70-200 2.8L Mk2 IS
17-40 L
24-105 L
100 L macro

I want to buy an extra body like 7d or 5d2 but the question IS:

Does the 7d AF/ Frame rate compensates the better IQ from the 5D2?

Thanks in advance

Regards,

Nuno