Looks pretty normal to me. On the other hand, i think that noise perception is highly subjective thing, if you're sensitive to noise, it may look too much noisy, if you're less sensitive, like me, then it will look ok. If 3% looks too noisy for you, then let it render longer, or use denoiser. There's no hard rule, that would say that 3% should look clean as a whistle. Different scenes will have different noise percentage treshold at which your brain will decide that the image is "clean", so you shouldn't look at certain number as a hard rule, but more as a guidance. Hope that helps.
