The body I have uses a hybrid focusing system. From what I understand it uses PDAF for finding initial focus then refines the focus point using contrast. Not all bodies do this though. The "pro capture" mode I've found incredibly useful. Basically buffers in busy mode, until you full press the shutter. This allows you to frame a shot and get focus where you want it, but only capture the frames immediately either side of the shutter press. Other cameras may do this, but it's new to me and very fun

I've got an Olympus em5 iii with the 75-300. It's not the fastest lens, but if you're in bright light it work well for everything I've done with it, and the whole set up is smaller and lighter than my old Fuji with the 55-200. Handheld image stabilisation on the Olympus cameras is also impressive even at these focal lengths