Lenovo doesn't have any current Thinkpad Chromebooks, but they had at least a few models in the past. Those qualified for at least pretty nice, depending on which CPU you optioned. If you picked a Chromebook model that used mainstream CPUs (ex Intel Core), chances were good that they'd have a SKU with a higher tier cpu (i5/i7), even if the case and the screen were nothing special. The atom and arm based ones didn't really have a high tier cpu to consider.

Of course, having found and incubated a useful niche, Google has canceled Chrome OS, so Chromebook offerings are going to be trickier to find.