Mesa 18.0/18.1/18.2 RadeonSI + RADV Benchmark Comparison With Radeon RX 580 / R9 Fury / RX Vega 64

For those currently making use of Ubuntu 18.04 LTS with its default graphics stack (Linux 4.15 + Mesa 18.0) and are wondering if it makes sense upgrading to a newer version of the Linux kernel and/or Mesa, here is an extensive Mesa+AMDGPU comparison testing four graphics driver configurations across three popular AMD Radeon graphics cards.