this is mr and took 12 hours. its now noisefree, cleaner then you would need it for animation rendering.
importon density of 0,5 and 6 indirect passes. lighting is a bit different as you can see, tryed to match the sun position of the maxwell render. used wide glossis everythere.
i also used fstop of 5,6 instead of 8 in the last render to make the darker parts brighter for better noise judging.
unified sampling with min1/max300 and quality of 12, 1 local samples for all shaders and the sunlight. ip samples 50 ans ibl quality 0.5, like in the first render.
in general, the classroom uses a lot of indirect lighting, this means you have to render more samples as you would need for more direct lighting like outdoors. so i am sure maxwell and mr will render faster with such a lighting setup.
for maxwell, does it use the linear workflow automatic? have i degamma all 8 bit inputs by hand like in mr? i wonder of this because the textures in maxwell renders are alot darker so i ask myself about that point.
would also be interesting to see some more maxwell renders and the rendertime/machine specs to compare quality/speed.