OK, I see what you're geting at
Well, for me it's just marketing speak. Let me give you my 5 c how I read these terms:professional quality imaging
: without a better definition that doesn't tell us anything, there's professionals that shoot with a holga rivals pro-grade optical viewfinders
: what does "rival" mean: better, as good as, almost as good, just as useful,..... for me it's horses for courses, OVF's will still trump in clarity, brightness, immediate feedback but are lousy for judging dof of the final picture and can't zoom in. EVF's will do much better at judging dof and can zoom in instantly for a precise focus check but will still (and some say always) lack the direct feedback and clarity of an image projected on a ground glass.flexibility and precision of an advanced DSLR camera
: I would read this as "advanced DSLR camera with the same sensor size", but maybe I'm too forgiving for the marketing dept here.
Obviously they want you to read more into it than I just wrote above and rush out to buy the camera unseen, but if you really analyse it their use of words it's just marketing speak that needs to be validated by real life test of people we trust (which is why we come to LL