>> Gigabit film is supposedly sort of a super-duper Tech Pan,<<(posted 8655 days ago)John, there's a good liklihood it's what they call a Lippmann type emulsion where the silver halide crystals are said to be maybe 10 or 20 times smaller (diameter) than a typical film emulsion. I think you have it right when you say "super duper Tech Pan.", because it also exaggerates the bad parts; ie, low speed, high contrast. I don't think these emulsions are that uncommon; they just don't have any "normal use" in the real world.
Kodak has more than a few such emulsions; here's a URL for a high resolution glass plate with resolving power (high contrast) of 2,000 lines/mm. The exposure index, however, is stated at 0.01 (I guess a tripod is called for). I think their "high resolution" aerial duplicating films, holographic films, etc. are likely Lippmann type emulsions too.
http://kodak.com/global/en/professional/support/techPubs/ti0424/ti0424 .shtml#expose http://kodak.com/US/en/government/aerial/technicalPubs/tiDocs/ti1073/t i1073.shtml
PS: after seeing the translation (thanks, Wolfram), maybe the Gigabit film is more general purpose (ie, usable speed and contrast)??