First test, with daylight, using the new Adaptive Sampler! There are definitely major improvements! Both images are rendered with Corona 6, I just changed the Environment Sampler, render time 10 mins.
With the new sampler, the noise level reaches a lower amount with fewer samples and it seems to bring more light inside. There are some fireflies, mainly in the shadows areas (under the coffee table and the sofa), that are not visible with the old sampler (NormalDep Compensated).