I had a Pentax K10D for a long time, it traveled with me around Europe and took a beating. Years went by and it was time to upgrade. I was going to buy a Nikon D800, then maybe a Nikon Df, then maybe a Nikon D810 or D750… so I eventually bought a Sony ILCE-7M2. I love it.
All cameras listed above have awesome sensors and are senslesssly awesome. Why the Sony? I was backpacking in the Lake District in 2013 and eventually there came a point when I couldn’t walk any further up a mountain with my very heavy backpack. I felt crushed. Fast-forward 2 years when I was getting new gear, and now weight was a primary concern. All the cameras listed above would have made me happy, but the Sony is the lightest, and the future looked mirrorless. Being such, it had some bells and whistles the other cameras lacked, so I went for it.
Image quality is great.
It is
If weight is a concern, Sony is your answer. If it isn’t, any of the listed Nikons will prove that only skill is your limit.
Sony lenses are expensive, while old Nikon lenses are good and cheap. I use a manual-focus Nikon 50mm f/1.8 and a manual-focus Nikon 24mm f/2.8, both through a Novoflex adapter. I take most of my photos using these two. I also have a Sony 70-200 f/4. I’m considering getting a Sony 16-35mm f/4 or a 24-70mm f/4, but would like to try them out first. As I don’t know anyone who has them, I’ve been stuck in this state of consideration for some years now… They have newer “GM” counterparts (f/1.something or f/2.something) but those are ridiculously expensive.