Have you tested this on your images or are you relying on the internet?
Everyone has a difference tolerance for noise, depending on the ultimate use of the image, your personal preference, how well you expose an image, what the subject is and so on. For example I rarely shoot at 400 ISO on the k-3 and consider that almost unusable for me. But others routinely shoot @ 3200 and get good results.
I would not (and do not) put much faith in internet reviews. They can be a guide but verify the facts in your own situation before making a decision.
Another thought is, when was that review written? Noise reduction technology has made huge strides since the k-7 was released. Lightroom can clean up a remarkable amount of noise and there are even better plug ins available. So perhaps when the review was written it was a problem, but with today's software, not so much.
Anyway, shoot some images and process them and see what you get.