I had the X1 carbon 3rd gen and I have the XPS 13 9350 right now, I don't see a lot of differences in the keyboard. Why do you like the ThinkPad one better?
I think the carbon keys have much better travel, and best of all, dedicated Home/End/PG Up/Down keys. Those are priceless to me.
I had trouble finding the specific generation you are referring to, do you have a link?
I'd rather suffer along on my XPS 13 after Lenovo's Superfish fiasco.
There is no Superfish anymore, not to mention I'm running Linux anyway. Besides, rest assured you are not safe with anyone, anywhere. Everyone is spying on you, and they are all very keen to know what you're up to. Knowing that, I am happy with the Lenovo.