Wow, Manfred!
My "ancient" (Ought '11) Macbook Pro running an "ancient" Snow Leopard OS, i7, quadcore laptop screams! I'd run it against anything short of a tricked out Mac Pro Tower and if that isn't tricked I'd put my money on the lapper!
I will put in with you on the screen (I have a 15"er), which is why mine has non-glare, but I keep it hooked to a 24" IPS while it sits on the desk!
I have run Final Cut Pro, Live Type (the old, good version and while rendering), Quick Time, Photoshop, Bridge, Garage Band/Soundtrack (while scoring), iTunes (doing format conversions and pounding out my fave R&R), Safari, Mail, Word, all at once and for sessions lasting for days. Never missed a lick! In fact, I have never, ever had to reboot an Apple computer since I have owned them from 2006.
Plus (and here's the best part), I can cook dinner on it!
These are the most processor intensive programs I use. Especially for BBQ-ing! I can't even imagine what kind of demands you must require!
I think I'll pass on upgrading for a while! Mine has an onboard DVD!