The FF3 is certainly one of the brightest, if not the brightest turnkey pocket led solution out there. the numbers have proved it. but its burst mode is primarily meant for momentary and short use; not for prolonged use. the copper heatsink on the FF3 works great in drawing heat away from the LED, but i would wary about using it for more than 1-5 minutes at a time. however, few lights are able to match it at this level.
That said, other lights with screaming bright outputs also won't hold it for long. the HDS 60s will go for about 10-15 minutes on high before its thermal sensor bumps it down to the next lower level. the HDS85s should be a great catch however, and brighter than the FF3.
Edit: the Jetbeam, which I forgot to mention, will only be direct drive for about 10 minutes, before it in turn drops down into regulation as well.
the jetbeam is also screaming bright, though the beams are different. the FF3 has a more floody beam and seems brighter to me, while the Jetbeam while still relatively floody, has a more concentrated spot. so with regard to your title, i'd say the FF3 is among the brightest at the moment in terms of total output. if you are talking about throw, then maybe a the fenix or jetbeam line might have the edge in throw =)
the comparable fenix line to the Jetbeam would be the LxT i think. which should be very interesting =) but i don't have one of those at this moment =)
beamshots of the FF3 & Jetbeam:
FF3:
DSpeck FF3 Max (burst)
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Jet-I on 14500:
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Edit: SF A2: