The 533 is a far superior camera in every respect, except the 585 has smaller pixels which can be a pro or a con depending on how you look at it.
Think of the 533, as being the same thing as your 2600, except, a 9mp square cropped out of the center of the frame. the 585 is a very different camera, and while it can certainly produce good results in the right hands, the 533 will, without doubt, stomp on it in terms of sensitivity, dark and read noise and full well capacity (therefor, dynamic range)..
As with most things - let the pricing model be your guide here. There is a reason why the 533 is considerably more expensive than the 585.
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