JPeg Engine

I am a bit confused naturally, this is a normal state for me. I have the A77 and the Zeiss lenses, all great. The reports i am reading about the sensor,is one thing, however, how much better can the JPG engine on Nikon or Canon be? I am new to digital and started with the A77 and Love it. I want/need the best Images i can take. Is there a huge difference on the IQ of the Nikon or Cannon over the A77 ?
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Mitchell
http://www.lombardsvision.com/