These cameras are aimed for the professionals, not for amateurs.
But, answering your question…yes, they improve our photography, but not as much as one would think. It’s not directly proportional, not by a long shot. Usually there’s a significant improvement on replacing entry level gear with better equipment, but in these scenarios…I guess you can expect that doubling your investment may give you a 10% overall improvement, if you learn how to use the new camera properly. Or maybe less than that.
But again, these are professional cameras, aimed at professional photographers.