This is a very difficult shot to take and be successful with, when you are trying to encapsulate both large and small scale elements within the single frame. You don't want to zoom in and crop out the landscape detail, which is excellent, but at the same time the runner would be more immediately identifiable to the viewer, if they filled the frame a little more. I think you have made the right choice and taken the best shot given those circumstances.
Although I might have been tempted after I had this shot in the can, to throw on a zoom and close right in and take a vertical, then zoom out a way and take another vertical and repeat. Sometimes landscapes can work in what we Brits call the portrait (vertical) format, rather than landscape (horizontal) format - it might have worked, but then it might not, but I would have been very tempted to try it I think.