I'm going to buy a new Macbook Pro for my wife, whose 2011 15" Macbook Pro just died last week with a failed graphics chip (just 1 week past Apple's Extended Warranty Repair program - Doh!) She is an amateur photographer, now transitioning to some professional work, and has Lightroom, Photoshop and Illustrator open simultaneously. I'm considering the 2016 13" nTB, 512GB/16GB RAM vs. the 2016 15" TB, 512GB/16GB RAM. She will have an external monitor to plug into if she wants a bigger screen for editing photos. We're not considering the 13" TB model since we don't see much benefit to the TB now for the price jump. From the searches I've done, others appear to have commented that they are able to work fine with the 13" model with those types of programs. I know that sometimes on her old 2011 Macbook Pro my wife would sometimes feel that things would "slow down" when she had all her programs open simultaneously, and I don't know whether the quad-core CPU and/or graphics card of the 15" would help avoid that (both choices otherwise would have the same 512GB SSD/16GB RAM). Any thoughts? Thanks in advance!