Until I get my 18.4 lbs Wabi Classic in august, I'm riding a bike almost exactly like this one:
I haven't weighed it, but it's so damn heavy I can barely lift it (I'm 5'11" and I am of medium build). They might as well have filled the tubes with lead at the factory. I think I can objectively say that this bike is "too heavy," at least to do any spirited riding or for carrying up several flights of stairs. What's objectively "light enough," I have no idea. My point is that there aren't a lot of absolutes when talking about weight. My Wabi will be the first (reasonably) light-weight steel bike I have ever owned and I can't wait to ride it.