I think if nothing else, this thread can be another proof of the Lumen potential. At least in the state PathTracer is right now - (and without spoiling too much) I think Lumen can look even better than PT, at least with certain tweaks and MRQ and because in certain conditions the color and light values can be better balanced.
Not to mention the advantage it gives you to work in real-time and to be able to rapidly make tons of adjustments and instantly observe the results.