I think you'll be OK, Mongo, as you have a Mac and they seem to be quicker with comparable processors than with Microsoft computers.
It depends on the RAW processors that you use. My Capture One Pro 6 chews up processor speed and RAM, so I ended up getting a new computer to accommodate Capture One, not because of the impending camera.
I am now using an Intel® Core™ i7-2600K Processor (8M Cache, 3.40 GHz) 4 core processor, 120Gb SSD, 8Gb RAM and 3 x 2Tb of memory in a Raid Array.