Can't help with a K-1 comparison, but on my APS-C cameras my eye needs to be fairly exactly central to enable a reasonably full view of the screen. I do have one of the Pentax Viewfinder Magnifiers, O-ME53, which can help when manually focussing, but that restricts the field of view even further. Removing the spectacles and adjusting the viewfinder on the camera can give a clear image in the viewfinder, but can make it difficult to see the subject in the first place, so it's all a bit of a compromise ... the design of your spectacle frames may be a factor to consider, smaller spectacle lenses may allow the eye to get closer to the viewfinder ... I've got used to it