I really admire those of you, where the difference of CPU/GPU speed makes a significant difference in your day-to-day professional work flow. If you are in this bracket, kudos to you. Because I am absolutely NOT.
For me, CPU & GPU speed very seldom has any impact on my business. For me, its about to be out there on customers, networking the hell out of it, standing on that exhibition floor or sitting in on technical seminars and luncheons to get customers interested in my service and exchanging contacts for future projects to follow up on. I wish I could tell you, - "Yap, the processor speed of those chips moves the world for me." - It just doesn't, sorry. It really shows, how unprofessional and old school I must be.
For me its still how to get into the customers faces and a subsequent service product. Processing CPU speed is just NOT my main concern and makes next to no difference. My humble respect as an alien creature that looks clueless on the discussion between ants, raging about the speed difference between M2 and M3 as it would be the most serious concern and mission critical. I just figured, I must be an ancient alien that's somehow survived mysteriously and should not exist in the first place. I wonder how I did survive with my MacBook Pro 17 from 2010.... Humble Alien greetings from Alpha Century from an ancient, long forgotten universe, where somehow the human contact still is NO.1
Now back to the main topic: M3 is really a tad faster. Damn... who would have though...