There is no need to be a professional to use these cameras, all of us can buy it and use it. But in my opinion, if you're a beginner you must first try with your iPhone and then move to the cameras but if you want to work as a professional from the start then you can use cameras. These cameras usually help best to an expert, but don't worry you can be an expert by first capturing with your phones. If you're not a beginner or neither a professional but you are a lover of photography and you've made it your hobby, and you are able to capture best pics then you're said to be an expert. Well here is the list of four best cameras for an expert.
1 - Canon EOS 7D Mark II
Using the concept of a semi-pro camera is great.it has new 20MP with autofocus Dual Pixel, Canon EOS is a camera with perfect image quality and a large viewfinder with 5D Mark III ergonomy, it has a very powerful AF (autofocus)and the most important that it has 10fps continuous shooting. you can enjoy your shooting with this Canon EOS 7d camera.
2 - Canon EOS 70D
Canon EOS 70D is a full DSLR camera with a touchscreen that rotates.it has the image quality up to 1600 ISO, with 19- AF (autofocus)in all cross-types. he most interesting, t has wifi built-in for remote control.
3 - Nikon D7200
DX-format DSLR w/ 18-140mm with VR Lens Nikon is the camera from one of the best cameras.
4 - Pentax K-3 II
Pentax is also a perfect camera for your next shooting.
Must check out the side effects (pros and cons) of these cameras before buying them. these cameras might have some problems that we are not aware of. So if you want to make your next shoot like an expert then you should check out these trendy cameras. I hope these suggestions will help you somehow in buying and deciding on a new camera.