Wacom just announced the second generation of Cintiq Companion. The ‘Enhanced’ version offers i7 5557U processors and 16gb of ram. Looks like a signifcant improvement over Surface Pro 3 (i7 4650U and only 8gb of ram). It’s also possible to connect it to your main monitor and use it as a regular Wacom tablet. Available for pre-order next month.
I think I’m going to buy myself a Cintiq Companion 2 Enhanced (there’s also a customizable version called ‘Enterprise’ which can be configured with even more storage (than 512gb).