I do a mixture of people/event, landscape, car and wildlife photography. Previously, the following kit worked well for me: Canon 6d + 50d Tamron 24-70 2.8 VC Canon 70-200 2.8 Canon 135L Canon 50 1.4 I thoroughly enjoyed this setup and took it with me across many countries, getting lots of good pictures. It was quite a heavy setup and now given I'm also carrying a DJI Mavic and potentially an Osmo, needs to be changed. I sold all my kit a while back, and moved to Samsung. The 6d was lacking in the AF department and too bulky for my needs. I have been using the Samsung NX system (NX500 + 45mm 1.8 + 85mm 1.4) for a while, and am on the lookout for a 16-50 2-2.8 as my main "portable" combination. The flaw in this system is a) not having adapters to use other lenses, and b) lack of any lenses 150mm+ with decent IQ and large apertures. I did keep the 70-200 and 50d, but feel these will be inadequate for safari next month. The following are the options I'm considering: Buy a 100-400mm Canon or Tamron, or even a 150-600mm and take this with the 50d. NX stays for general purpose. Could also consider a 7d or 7d II for their speed, but then even short video clips would be a pain. Buy a Sony A99 II or A7 III (A9 is also possible but stretches the budget significantly) and a Tamron 100-400 or 150-600mm, sell the Samsung setup when I'm back and buy some additional (wider) lenses for the Sony. I do like the shutterless time lapse functionality of the Samsung - do Sony cameras offer this? The two main questions: What's the focus speed in the real world of the A7 III vs A99 II vs A9 - people seem to say A9 > A99 II > A7 III but having rented an A9 briefly I wasn't impressed, and think the A99 II may suit me better. I also owned an A7 II for a while but it was extremely sluggish for me, even compared to the Which of the two options above (expand Canon system vs. switch to Sony) sounds more sensible? Video is definitely much better on Samsung and Sony, and I do like a lot of the newer Sony features.