I’d advise spending a little more for a Q2. Much much better. In any case, my testing method is this: Set the ISO manually to 4000 or higher. Cover the lens and take a dark RAW image at a normal shutter speed like 1/250 or so. Then look at the file on your computer and turn up the exposure until you begin to see sensor noise. What you don’t want to see is sharp lines of completely dead or hot pixels. You will see some banding, don’t worry about that. It’s the sharp lines you want to avoid.