This is a very nice shot and I do not believe you could have done better with more expensive gear. It is the photographer, camera and lens are only tools.

If I had something to point my finger to it would be the horizon. It is too close to the mid line which divides the image in two equal parts. In competitions that is usually a no-no. Perhaps in this case lowering the angle of view of the camera could have resulted in a more pleasant visual design. From the practical standpoint it is a very nice image and very pleasant the way it is.

No need to go back with "better" gear. You did exceedingly well.