I agree with FS-Marc. It's definitely the noise in the Glossiness channel. Makes sense you would see it more at an angle with the Fresnel effect in play. Here is an example of yours on the left, and the noise shader's scale set to .05%. This is only 15 passes with no denoiser.
On the creative side, I would look at your shadows. To my eye, they seem very dark for such a bright room in my opinion. If that's the look you want, then you're done, just to my eye they seem too dark.