The SSD Review published a review on the Samsung 850 EVO With 3rd Gen 48 Layer V-NAND SSD Performance Comparison A quote from the article:

Out with the old, in with the new is how the saying goes! Although, in this case, the old really isn't that old and is still quite bleeding edge technology. This doesn't stop Samsung though. Today we are going to take a look at the performance of Samsung's 3rd generation 48-layer 256Gb TLC V-NAND. That is right, Samsung has now transitioned over to yet another generation of 3D NAND when other manufacturers have yet to even release any products with their 3D NAND, although, they are right around the corner.

 Samsung 850 EVO With 3rd Gen 48 Layer V-NAND SSD Performance Comparison @ The SSD Review