OK, I've been in the photography business for well over 30 years. Don't care if it sounds old fashioned or not, but I do not want to practice my still photography using a TV screen. Optical has a much more natural direct realistic feel to taking pictures. I've been waiting forever for a new high megapixel full frame DSLR to come out like a 5Ds (or sr) Mark II and now I hear junk about a mirrorless instead. I NEVER plan on buying a mirrorless. Am I the only one that feels this way????? If so, I'll stay proud of it. I feel camera manufactures are pushing us towards Mirrorless for only one reason, to sell more cameras to people falling for it. I'm sure someone responding to this question will list all the attributes to mirrorless, but let me be clear....I don't care. In my opinion Optical out weighs them all.