Free Mat Test Scene
As promised, here is the material testing scene I used for my recent Materialism tutorial.
It is a very simple scene but it may be worth downloading nonetheless as the archive includes a very high-res, 90MB HDR map. I thought about downsampling it but the high resolution is actually necessary to generate the sharp, realistic reflections you need for this kind of test scene.
Hope you find some use for it. Download it here.