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the asi533 hits unity gain (1 e-/ADU) when the camera gain is at 100. that is also the camera gain where the HCG mode kicks in, so read noise at that setting is <1.5 e-. the full well at that setting is ~16000 e-
for the asi585, when the camera is at unity gain, the read noise is still at about 3.8. low read noise (of about 1.1 e-) doesn't kick in until camera gain is at 250, and at that setting the full well is only about 2500 e-
so the 533 has more dynamic range, deeper full well and lower read noise at the settings you'd want to be using. the 533 also has bigger pixels (3.76 microns, compared with 2.9 microns), so will offer more sensitivity than the 585 (at the expense of resolution) if comparing both sensors on the same optic.
finally the dark noise of the 533 is about one quarter that of the 585.
all together, the 533 has more dynamic range, deeper full well and is less noisy than the 585. if the optics are fixed, the 533 will be more sensitive than the 585 (even when the QE of both sensors is factored in), albeit at a slightly lower resolution.
(disclaimer - I own the QHY version of the 533C)
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