Honda currently have the contract to supply - that can change. The new engines would be given certain specs to follow - ECU, mounting points, weight, power. You wouldn't know the difference unless you worked in the pits or rode the thing.
What makes you think that? MV, Suzuki, Kawasaki, Rotax, CCM, KTM, all make engines that would suit - Honda and Yamaha aren't the engineering genius' you think - they are the ones that spend the most money promoting their products and have managed to sit at the top of sales, doesn't mean they can't make a damned fine engine.
I suggest you learn how, then go and ride the current crop of 600cc bikes and see for yourself. Personally, I am not a fan of the Honda. The Honda engine is fragile, the ergonomics are made for Pedrosa. The Yamaha is a really comfortable and fast bike, but not suited to my heavy-handed approach. The MV is much more my style, being expensive, exclusive, exotic and uncomfortable
And before you write off the Hyosung, don't forget who makes the bulk of Suzuki mid-range engines these days... the Hyosung 650 is a rebadged SV. I like them, nice engine, full of character and there aren't many mid-range twins out there any more.