Joseph S Wisniewski: You folks have no idea how much "wow" is in a T2.9 zoom like that.
70-200 parfocal (no focus shift when zooming) and hopefully no breathing (coverage shift when focusing). It's got to be at least as complex as any Nikon or Canon 70-200 f2.8. You're taking 20-something elements, and a light loss of 0.1 stops (weird coincidence, log2((2.8/2.8)^2) = 0.10)
Most elements in a modern lens aren't cemented, but let's do worst-case and guess that some are, so there's 30 air-glass interfaces (surfaces, LOL). That's 0.0033 stops per surface. Or under 0.8% reflection per surface.
That's some serious coating.
Do we know that it's an f/2.8 and not, say, f/2.5? A .10 stop light loss with 20 or so elements seems insanely low.
Are the Japanese averse to viewfinders? This is getting absurd.