I haven't used medium format but their comparison seems accurate from what I've experienced coming from a 24MP D750 and chatting with other D850 owners daily. The files are truly massive and with sharp glass maintains detail extremely well with heavy cropping and/or large printing. The best example I have of this so far can be seen here: http://ssphotog.ning.com/photo/rainy-day-special
Thank you Lois, I've been really enjoying your landscapes as well and hope to see more! Do you have a separate photography page? I'm aiming to do more landscape work myself going forward, keeping a wideangle lens with me more often.