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I haven't noticed any issue with colour saturation myself.
Ideally you should be using RAW file format, and things like colour saturation can be controlled at the post-processing stage.
Of course, there are people that prefer the convenience of JPG straight out of camera, and there are some settings available to change colour saturation. Go to Menu > Brightness/Color > Creative Style, and choose what style of image you want (ie, Standard, Vivid, etc...). Vivid would produce higher colour saturation images. You can also further customise these Creative Styles by hitting the Options button.
Since changing to RAW my pictures look (to my old eyes) much more vibrant and contrasty. I didn't realise there would be such difference from Jpegs and its much more fun using RAW, I almost feel like a proper photographer
Sony, in general, has different saturation characteristics than on other camera manufacturers. Yes, I know, that's an obvious statement. I personally find the out of box settings to be a little more saturated than Olympuses, but less than Canons, but not more than Nikons - with a different color palette than any of those. But no matter what the out of box settings, the NEX allows a large amount of control over saturation, color temperature, and white balance - all of which means you can make the color of your images look anyway you want. And all that is accessible in JPEG settings. Of course, shoot RAW and adjustment is infinite.