I agree with the guy who said if you're happy go with it.
Btw I have older eyese now too. I found a wonderful trick I have been missing with tHe d700: when I shoot on a tripod and use live view I can zoom way in and focus on the LCD. Allnthismin manual focus of course,
This works around any issues with diopter (which is different from the d700 on this camera in a bad way) and eliminates any possible front r back focus issues.
Carefully done this approach gives me an image that can not be any sharper. I wish I discovered this about 3 years ago. I get much better results than relyiing on autofocus.