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I started out with a 1000d and progressed up to the 5DMKIi. The difference is night and day, the colours are so much more vivid. The full frame is awesome for landscape shots but for Astro work, let's just say that is been an expesive learning curve.
Due to the full frame, images appear smaller and vignetting is a big issue I've yet to tame, I'm talking Astro here. I had to by a field flattener for my refractor where as I could get away without it with the 1000d. Because the image scale is smaller I bought a 2x power mate just to even close to the scale of the 1000d. And don't let anyone tell you that noise is not an issue with 5 d MKII, because it suffers noise like all the rest. Unless it's cooled your gonna get noise.
In think that for Astro you want that 1.6 crop factor just for image scale and vignetting so maybe the 7D would be better for Astro work. But for landscapes and everyday photography you would be hard pressed to beat the 5D MKII.
Cheers
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