Hot Hardware published a review on the Samsung Galaxy S8 And Galaxy S8 Plus: Android Excellence, Superior Performance, Striking Design A quote from the article:

We've been fortunate enough to have spent a little over a week with both the Galaxy S8 and Galaxy S8+, specifically T-Mobile variants. Frankly, that's not nearly enough time to properly evaluate such a complex, full-featured pair of cutting-edge devices, but alas this is the peril of high tech launches and the relentless pace of innovation.

So, we decided we're going to do what we do best here at HotHardware, and that's to give you our assessment of performance (from a number of metrics) and the experiential view of these new products. We'll skip the flowery product lifestyle showcasing and slick video pans and fades, and dive right into the meat of how these two jet-black beauties we have in house measure up in the current smartphone landscape.

 Samsung Galaxy S8 And Galaxy S8 Plus Review: Android Excellence, Superior Performance, Striking Design @ HotHardware