I downsized from a D800E with the "holy trinity" f/2.8 zooms to a Fuji X T-1, initially with a ton of primes and now with three zooms, 10-24, 16-55 f/2.8, and 50-140 f/2.8. The Nikon and three zooms weighs almost 10 pounds, the Fuji system just about half that. I rented the Sony A7RII and liked it a lot but with the same basic zooms (16-35, 24-70GM, and 70-200GM), it weighs almost 8 pounds. I don't print larger than 13x20 so huge megapixels mean little to me; I anxiously await the upcoming Fuji X T-2 with its rumored 24MP but am pretty happy with what I have. I don't do sports or fast moving subjects (except for my 2 year old grandson) so super speed focusing doesn't really matter either. For my purposes it's a great system. Bottom line, I'm happy with my prints. Everyone's different. Rent a Fuji, or a Sony, see how it feels, do the math on cost and weight, you'll make the right decision for you and that's all that matters.