My answer is not rhetorical, but a sincere belief. Edward Steichen once said "No photographer is as good as the simplest camera" I hate to sound harsh, but if Steichen, whose photographs date from the beginning of the 20th century, had no technical problems you should not either. Could your problem possibly be something else?
The pictures you posted are nothing special - almost ANY camera can reproduce these - it's all about the light and composition. It seems you are chasing the silver bullet - a camera that magically takes good pictures, no matter what the guy behind the viewfinder does.
Stick with ONE camera and practice!
How interesting about many of us at RFF. You come here asking why your photos aren't what you want, and ask what camera will help you get better. And you get many gear related answers. I would suggest that isn't your problem at all.
I have known people who used some really cheap cameras. The cameras didn't have many modern features. They couldn't afford a better camera or fancy accessories. Didn't matter. They found ways to get what they wanted.
They took a non-fitting filter and carefully held it in front of their lens for better contrast. They braced themselves on something immovable when the lens wouldn't open wide enough for shorter exposures, because they didn't have a tripod. And they lived with the fact that they were going to miss some photos because their gear wouldn't support them. But not many, because they were always thinking of ways to make what they had work to get the photos they wanted.
In general these people loved making photographs. They wanted good photographs, so they figured out ways to get them. There are 'technical' things you need to learn. You learn by reading, asking questions, and experimenting. But why do you think camera choice alone will get you what you want? How do you think some of the well known and respected photographer of 50 to 70 years ago got good photos without the gear and accessories we have today?
My suggestion is stop focusing on gear. You need photography basics first. Look at lots of photos. Determine what is it you like about the ones you do like. Composition, color, play of light, contrast, a combination. Then look for that kind of scene to photograph. If it doesn't look as good as it should, compare it to the one like that which you liked. Why doesn't it? If you don't see why, ask other photographers.
Good photographs are almost never dependent on gear. Rather, on the photographer who develops an ability to 'see' the world in a certain way, who then looks for ways to record what they see photographically. You have an ability to see good photography, as shown by your choice of photos to show us. How about showing some of your own? We may be able to give helpful suggestions. Or we may think you have an ability you don't see.
One last thing. Many famous photographs have been altered by extreme dodging, burning, contrast changes of paper, and so on. More have had little change over cropping. Don't pay too much attention to classical darkroom manipulation, or computer aided manipulation. Strive for photos that are good without that.
Sorry for the long read, but I don't think your problem, nor most people's is gear. It is just very basic photography done well.
