Go with A55. It's worth extra money over A33. You can also go with A580. These are entry-level cameras, but the IQ is just as good as semi-pro APSC. The semi-pro models however have better build and ergonomics.
It's open secret who made Kx sensor. Sony did. Before K20D (Samsung sensor), all Pentax DSLRs's used Sony sensors too. Except D3s/D700, all Nikon cameras have Sony sensors. It's Sony's 12 MP CMOS sensor in Kx.
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