Pros and Cons. There’s no getting away from the fact the Sony 100-400mm is more difficult to handle than the Panny 100-400mm due to the size and weight meaning that handheld slow shutters pans are tricky. There’s not doubt the IQ of the Sony 100-400mm is better but due to the relative lack of reach you have to crop more meaning the IQ advantage is negated somewhat.
In terms of handling the Tamron 70-180mm and Olly 40-150mm f2.8 are about on par, but you lose 120mm effective reach with the Tamron so I’d say advantage Olly with that.
The A9ii body definitely wins though. The EM1-II is superb, but the A9ii is truly epic. Shooting 1/125 shutter and higher with realtime blackout free shooting almost feels as though you’re cheating

Less that 1/125 you don’t get real time view with the A9ii but it’s not quite as bad as the ‘slideshow’ views you get with other cameras and I actually still found it easier than dealing with the blackout of the mechanical shutter. I kind of forgot how fast it shot and ended up with A LOT of photos on Sunday