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To be honest, I don't know, it was something I thought of also before I started imaging with my 700D. However, Jerry does say on his website that he believes that you would only see the difference if you have:
1. A large telescope with excellent optics
2. Proper thermal stabilization
3. Excellent collimation
4. A master planetary astrophotographer with great technique
5. Excellent seeing conditions
Meeting all five of these criteria is rare indeed.
The main factor in all this is #5, I don't think you would notice a difference recording at 1:1 or close to (in my opinion only). However, from all I've seen online, the biggest difference you will see to your images (short of buying a dedicated planetary camera like the ASI224MC) is if you record the Liveview video stream at 5x zoom rather than recording movie files inside the camera.
Andrew
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