Evidently there is a p50s which is a thinner model. Does the p50s also work with the p40 yoga or x1 yoga's pen? http://shop.lenovo.com/us/en/laptops/thinkpad/p-series/p50s/?sb=:00000025:00003D41: How would we find out without taking the plunge? There's also a 3k display version at least for the p50s. Does only the full HD touch work with pen?