I kind of dislike this thread, but what the hell, here goes nothing:
Intensity
I don't recall seeing anyone running leds at 50+W/sqft. Let alone top bin DIY driven softly.
Scale
Most of the led grows you see are on micro level, small plants = small buds
Efficacy
Almost all grows posted are done with bought cheap panels and that usually means they are not even as efficient as HPS at producing light. Not even the expensive ones beat hps in efficacy (A51 etc). What makes it interesting, that you still see an occasional 1gpw or + grow with china panels that are under 30% efficient.
Skill of the grower
Skill takes time to develop, most of guys with years and years of growing experience run HID's and bigger ops with financial interest going on. Just the opposite with leds, mostly newbs or just small scale head stash growers = yield isn't necessarily top priority.
Most of led grows are affected by at least one of the above and likely multiple handicaps, so a direct comparison is pretty pointless.
Show me someone with experience running 600W+ worth of 40+% efficient leds at 50+W/sqft and let me know if the results arent comparable to HPS. Just sayin, comparing fruits' n' berries.