Apart from the usual subjects (sports and wildlife) the Nikon has an absolute advantage in multi TTL flash, that can be essential in event photography or in quick out of studio portaits. On the other hand, there is not only size, weight and discretion in favour of Fuji mirrorlesses. For example, the camera is much less demanding on tripod and tripod head. It has no banging mirror, almost no moving parts, apart from the shutter, and for exact on location work the LCD is the best framing help I can imagine. For example, you can use the Fujis in portait position on a ball head without resorting to L-bracket, even with a light carbon tripod. So for outdoor work it's the whole system that becomes lighter. The upcoming Fujinon 14mm and Zeiss 12mm lenses will make the camera more interesting for architecture, documentation and real estate photography.