Yah know.... I keep listening to the files again and again, and the more I listen to them the more I like the Gemini over any other one in the that comparison test - even better than the U67 ! It is just much more detailed and warmer (the U67 is a more "balanced" sounding mic). The 5600 is not bad, but you can hear less bottom end and less fattness with the single tube SE mics (i.e ICIS, 5600) than with the Gemini. Actually, the warmth and the fatness of the Gemini *may* be a little problematic sometimes, when you want a more natural "real world" sound from the source. But the vocals, piano and acoustic guitar that are in test sound so warm, detailed and full with the Gemini, like no other mic did on those recordings.
At this point, I think I'm going for either the Gemini, ICIS or Z5600a. The Gemini would be my first pick, but again, it's costy. But again, I'm not sure I'd like that colour over anything I am going to record, although it just makes everything sound "wow"... so much detailed, warm, focused... intimate.
On the other hand, there's the ICIS which is much, much less costy. I can get it for about 300-350$ ONLY !! amazing price for such a beautiful sounding tube mic ! Also, always keep in mind that the sound character can change and get even better with a NOS tube in it, so there's a lot to experiment with it.
As for
the Z5600a, I must say it sounds a bit too bright to my ears, on both the vocals and acoustic guitars - which isn't so good (was it the mic positioning / axis ??). But on the other hand it is much more versatile as it has 9 pattern combinations !! So technically it is idial as an all-around mic. But would a different tube make it less brighty and fuller sounding ?? I can't know till I try.
So the decision to be made in this case is not simple.
As for the 2200 / 3300 - they sound very good for their price, but I would consider them mid level mics, far from sounding as good as the 3 mentioned above, but very good competitors to the AT4050, AT4033 and other FET mics at the same price.
So now, it's the Gemini, ICIS or Z5600a I have to decide about.