I currently have an old Macbook Air 2011 and use it for photoshop, sketch and moderate web browsing. Unfortunately Chrome eats up all the battery as if it was made out of candies, so I need to use Safari. Recently I started playing around with Final Cut Pro and came to the conclusion that this laptop simply can't make it. 720p videos work great, but as soon as you start editing something in 1080p (especially during the export), the poor Mac reaches temperatures of 95°C with fan speeds of 6500rpm...
The Razer Blade Stealth with the 4K display looks very appealing. One more thing that I would definitely try to do would be to convert this beast into a hackintosh. I actually built a hackintosh about a year ago and use it as a daily desktop computer. (now, before any windows fanboys come up and start yelling at me: I actually do not have windows as a dualboot option because I just didn't happen to use it that often, so what I do is that I just run windows in a VM on a Hackintosh^^)
Given the number of entries it is going to be practically impossible to win, but I guess it's worth a try