For those interested, I'm back up to bat this week at Ref21, giving brief summaries of Calvin on justification, faith, and works.
Of interest, Calvin believes (rightly in my view) that "judgment/reward according to works" is referring to eternal life (not some extra heavenly rewards), and it describes what will happen to believers (it is not hypothetical or applied only to unbelievers). And yet, of course, he is a passionate advocate of sola fide.