One commenter has asked for more information about my photographic equipment. Although the brand doesn't matter much because all the main brands are very good, I shoot Canon. I have both a full frame 6D and a crop sensor 7D. Neither are state of the art; the 7D was first produced about 10 years ago and the 6D about 5 years past. Canon has since produced newer versions of both, but the equipment still works well enough for me although if I were richer ...
Nikon and Canon are the main players in the DSLR (Digital Single Lens Reflex) market. They both produce crop (APS-C) sensors as well as full frame sensors. (To some degree I discussed the difference in sensors here in a previous post.)
Sony also makes DSLRs, but they are more heavily into producing mirrorless cameras, both full frame models and APS-C versions. Mirrorless cameras are smaller as are their equivalent lenses, so they are becoming a very attractive option to the extent that some pros, who can afford it, have switched to this platform. For most of us, discarding one system for another is price prohibitive, and to repeat, every manufacturer makes good cameras these days. In fact, it might be said that most cameras are better than most photographers who own them. On Flickr I see great photos from people with less expensive cameras and mediocre pictures from some owning very high-end equipment.
In addition to Sony, Fuji also makes a very popular brand of mirrorless cameras. As far as I know, they have stuck to crop sensor models so far, and people who own them love them.
Olympus and Panasonic make even smaller mirrorless cameras with 4/3 sensors somewhat smaller than APS-C. But from what I understand they also yield excellent results and some professionals have switched and are pleased with the results
At one time, larger full frame sensors were considered superior, and they were, just by the virtue of just being larger. And I suppose that's still true because, all other things being equal, bigger is better. However, digital technology has improved so much since the early days that most people can be very happy with any of the above brands and sizes.
Perhaps I will discuss my lenses in another post.