As an enthusiast that takes portraits, travel, some macro, some wildlife, and a desire to do more sports and birding; I've always wanted to upgrade my SL1 to a full frame sensor/mirrorless. Price is a big deal for me, and I want to buy once cry once--i want a camera that will last me the next 8+ years. Reviews on the RP look great, and I don't pretend to be an expert--im confused though, because while the R6 mkii has a few nice features I can't see why it costs ~twice~ as much. Is the R6 mkii worth the upgrade, and/or will it be more future proof?