Im on the fence about buying a late 2013 15" rMBP to replace my mid 2011 iMac. My main reasons for considering the switch is the added mobility. Not only working on the go, but Im a photographer and would like to be able to shoot tethered with my D800.... and the iMac isn't feasible to take on location. 80% of what I do is photo editing, and 20% is video editing. My current setup is the 2011 27" iMac plus 2 27" thunderbolt displays. If I purchased the MacBook, while I was at my desk it would be connected to the 2 27" displays, plus a mouse and keyboard so that is effectively became a desktop. If I purchased the MacBook, I would likely sell my iMac because I dont think I would need both. What im trying to decide is how the two would compare in performance. My iMac is: Mid 2011 3.1ghz i5 16gb Ram SSD 1gb nVidia 6970m graphics The rMBP im looking at is: Late 2013 2.3ghz i7 16gb Ram SSD 2gb nVidia 750m graphics On paper, the Macbook seems like it wouldn't be a step down, and with TurboBoost to 3.5ghz it may even be a step up for most tasks. It would have a faster SSD, a better graphics card, and the addition of USB 3 would open up more doors for affordable external storage. The only place I can see a potential step down is during heavy rendering tasks in Premiere where multiple cores are being used for long periods of time.... the lower clock speed of the MacBook may show? Opinions are greatly appreciated. Im getting ready to travel for about a week, and if I can make up my mind I may go buy it tomorrow so that I can take it with me. Thanks in advance.