Based on GeekBench alone, so take it for what it's worth to you, the RMBP is about 2x faster than what you have. The RMBP clearly has a better video card which I'm sure After Effects and action games will make good use of.
This may be a dumb question, but I want to make sure before I make any decisions. For heavy use of the Adobe Creative Suite (mostly Premiere and After Effects) and gaming, which is a more powerful computer?
MacBookPro5,3 (The computer I have now)
Processor Name: Intel Core 2 Duo
Processor Speed: 2.8 GHz
Hard Drive: 500 GB
Memory: 4 GB
MacBook Pro with retina display (The computer I want)
Processor Name: Intel i7 Quad Core
Processor Speed: 2.3 GHz
Hard Drive: 256 GB
Memory: 16 GB
Obviously I'd be making a huge leap in terms of RAM, but I am concerned about the drop off in processor speed. Will that be noticeable?