Oooooooo. That's a nice dark red clone. Now I'm jealous. Exceptionally nice. You should take it in for judging.
As per the scent, there are some around here that'll call you crazy, but I believe you. I never noticed it on my WSG, but I have a different humboldtii hybrid whose flowers were noticeably scented.
I recall it smelling a bit like animal urine but without the foul/rank notes, just the musky and perfumey elements. It's not something that people would call pretty, but I thought it was far less offensive than the more notorious Bulbophyllums. Of course, your plant and my plant could smell completely different given that they're two different hybrids, but I assume there's probably some resemblance.
I found it odd since there was really no mention of humboldtii/popowii having fragrant/scented flowers in any literature (online & in books) that I could find.