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The 6D is a fair bit less noisy than the 600D at the same temperature, but you'll still get noise speckle in your images on warm summer evenings, the 6D is just more tolerant of it. Just beware that a full frame sensor exceeds the imaging circle of the Esprit 80, so you might do just as well with a less expensive competing crop chip.
For your 600D...try dropping the ISO down to 800 and see how you go. The gain is quite high at 3200, with the unity gain being around 200. For the 6D it's closer to 800, so there's less amplification going on when using 1600 or 3200.
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