The Q certainly has handling issues with adapted lenses: it can be hard to hold steadily at times, and focusing or even framing could be difficult with longer lenses. However, after using it for a while, you'll figure out workarounds for most of these issues. My advice is to get the genuine Pentax adapter, as then you'll be able to use the Q on a tripod with all of the lenses you've mentioned. The leaf shutter is also very nice to have. Also, get some sort of optical viewfinder, as it will help you compose your images.
Aberrations generally aren't a big issue until you start using very long focal lengths. There will be diffraction if you stop down too much, though. Definitely try shooting close to wide-open at all times.
The bottom line is that the Q has the potential to outperform APS-C DSLRs at longer focal lengths, but this comes at the cost of handling. You'll also want to keep the ISO locked at the minimum setting.
Have you seen our Q adapter review?
Pentax K to Q-mount Adapter - Introduction - PentaxForums.com Adam
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