afaik, the raw noise in k7 is still with the competition, i feel it boils down to your peference for the graininess, whether u like it fine-grained or plastic-smooth..k7 in-cam noise treatment can also be set according to taste: off, medium or high; & starting @ xxx ISO
however just a quick general observation, whatever APS-C sensor at high iso also sucks to me lah

iso 1600 and above whether any brand, better not be your bread and butter

i'd rather focus on indoor flash technique.
i prefer retaining the grain later for some fine-tuning noise control, which gives better results than my camera screwing with NR, note that some other brands have "hard-coded" noise treatment which may be too much to begin with.