Dude been having the same problem here, everything happened after I turned off auto exposure, so the only way around I found was to uncheck the Auto box and modify the exposure on the case below -4 works for me. The only bummer is that you need to do that for every material or go back to auto exposure.
And if you want your material to look like the one in the picture you should have a metallic value of 1, as I see you have no value on that slot.
Hope that helps.