I would suspect that most D800s are much alike, assuming similar shutter counts, hence my wondering about comparing with a different Nikon FX model. Obviously the closest equivalent is indeed a D810, rather than a D610 or a D750. I use a downmarket D610 which doesn't seem to suffer this issue, indeed it sounds better damped than any other DSLR I have used. Pixel count is really only an issue if you are in the habit of heavily cropping or making A2 prints. The Sony SLTs indeed use an EVF, whether it can be seen as combining disadvantages of both mirrorless and DSLR types is debatable, it does overcome the slower operation of CSCs and the translucent mirror does act as a partial barrier to dust reaching the sensor.