Quote: forgot to say I had battery grip on,and with the da 300 +tc +tripod mt it was lighter or the same..maybe it was the balance on Nikon made it feel that way? was not about price as D4 is way too much $$..just ease of handling
What? There's no battery grip for a Nikon so you could do an apples to apples comparison? I guess the comparison for you is a good one. I carry extra batteries instead of a battery grip... so I would find the Nikon both heavier and bigger. And the lens to compare on a Nikon FF 80-400 to an APS-c pentax would be the DA*60-250, to match the enlargement of the 150-450 on a Nikon (or any) FFwould be almost 700mm. I guess when you did your comparison, you didn't notice the difference in subject size.
So exactly what did you compare? Weight and "handling." without respect of the 1.5 crop factor, or the ability of the Pentax system to lose the weight of the battery grip? Seriously?
I take it you are one of those who has big hands and has to have the battery grip for handling. It's the only way your analysis makes even a bit of sense.