Anyone used newer Sigma 100-400 DG Dn on better tracking Sony AF cameras

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WhistlerNorth Regular Member • Posts: 352
Anyone used newer Sigma 100-400 DG Dn on better tracking Sony AF cameras

I know the Sony 100-400 is great lens with lots of keepers. Just wondering how well the Sigma works with the better animal and eye tracking  on A7C , A9s, A1 and A6600.  Yes I know if one has an A1 that  they probably can afford the 100-400  and have it in their gear. I do minimum BIF but guess if I had the 100-400 Sony that could be different. 
The  weight and price of 100-400 holds me back. I have preordered the Sony A7IV and right now the Sigma is on sale for $150 off.   I shoot wildlife exclusively only  25% of the time as usually main focus hiking. I do specific wildlife focused trips every 2 years.. been less with covid.

 WhistlerNorth's gear list:WhistlerNorth's gear list
Sony a6500 Sony a7 IV Sony FE 28-70mm F3.5-5.6 OSS Samyang 12mm F2.0 NCS CS Sony FE 70-300mm F4.5-5.6 G OSS +3 more
Sony a1
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