I remember a lovely discussion at one of the Russian forums not long ago.
As Pogosyan said, 'Su-80 is a shame of our design bureau". In short, designers view on what airplane local airlines/cargo transporters need, is far different from what they really need from potential buyers of view. And, it's damn expensive bird! Being cute for eye, airplane totally aside of current infrastructure, financial capabilities and even ergonomics of dying local airfields of mother Russia. One of examples - you can't step in without a ladder, cabin floor is too high. While Sukhoi sale persons tried to commit that 'every local airfield has appropriate ladder for that - to a person who happened to be former local airlines pilot (and knew exactly that this is hell not so in fact). After he explained them that they are out of this world, they became grumpy and said something like 'F***k off. We are serious guys, we are making sales. You are hampering us to make our job."