I think that beyond the wider palette, its the contrast that makes it more varied. FC5 seems to have a much darker contrast, which is pretty accurate for that 'thin atmosphere' look in the sky that you get at high altitude.
I live close to Lake Tahoe in Ca. When I drive up there (I think its something around 7-8k feet) the sky looks WAY different. There is a certain kind of clarity in the atmosphere, hard to explain. The sun beats down HARD, you literally feel it burning your skin and clothes in the summer on a clear day, even if its not that hot.
Its the weirdest thing. There is just something different about being up at altitude, its like a different world.
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