1) Is the IQ between the 60D and 5D huge? Like in the out of camera RAW files. Also I do a bit of PP in Lightroom.
Differences are small out of camera, and gone after processing, ISO 100-800. At 1600 and higher the 5D2 pulls ahead, though the 60D is still quite good. I consider 3200 the highest usable ISO on that crop sensor, 6400 on the 5D2 sensor.
2) I understand the ISO performance in the 5D is better than my 60D, but I tend to not go beyond 800 and try to stick to 100 as much as possible. Will I see substantial difference in ISO performance when shooting in ISO 800/1600. Or even at low ISO such as 100.
You start to see a difference that survives post processing at 1600. At 100 there is no difference.
3) Any idea if 60D's AF system is better than 5D Mark II or not? I shoot wildlife, but not too often though. Mostly landscape, portraits, street, still life.
About the same.
4) I have a 24-70 f2/8L, how likely will I get better results when paired with a 5D MkII. Is there any focus microadjustment function in 5D MkII?
The FL of that lens matches full frame better. Otherwise it's a wash.
5) They say bokeh quality in full frames are better/creamier, if that's true is it really that noticeable?
Bokeh (blur quality) is entirely a function of the lens. Blur amount is a function of DoF for detail near the plane of focus, and FF can provide more shallow DoF. For detail far away from the plane of focus, physical aperture size determines blur amount regardless of format.
So in certain situations FF will give you more blur. You will notice and appreciate this on your f/2.8 zoom. On fast primes FF generally gives DoF that is too thin, leaving you stopping down any way. I don't consider FF DoF to be an advantage with fast primes. It's too thin and when you stop down to compensate you lose the high ISO advantage. It just doesn't work out in the real world apart from studio portraits designed to show off super thin DoF instead of the model.
6) How about the dynamic range in 5D?
It's about a stop better.