Performance close is not performance exactly the same. Also there is the issue of focus speed and compatibility which thanks to docks is being dealt with.The fact that Sigma and Tamron haven’t supported the RF mount and the rumours heavily imply that this is Canon’s doing shows they care very much. I highly doubt Canon would be charging £2900 for the 100-500 if the below were available natively on RF with AF performance close to OEM glass.
Sigma 150-600 f5-6.3 Sport - £1199
Tamron 100-500 f5-6.7 - £1199
By locking out Sigma and Tamron from the RF mount sure more profits for Canon but less money in Canon shooter’s pockets.
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