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The Sony CZ lens is way sharper than Canon's 24-70, however, the new 24-70L II should be much improved over Canon's old one. If you're happy with the Sony, and if landscapes is what you primarily shoot, keep it - the IQ is better than the 5DmkII under 400 ISO.
One thing that I find is really helpful with landscapes is manual focusing in live view, which the A900 does not have. It might be worth it to switch just for live view.
Any reason why you didn't mention the Nikon D800?
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2007 Volvo V50
Taken by ex: 2005 Toyota Prius.
R.I.P. 1997 Lexus ES300. 
R.I.P. 1989 Acura Legend Coupe LS.
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