Sigma or Canon lens for Canon R5

Thank you for the comments. Here is a lens comparison.
Canon 100-500mm & 1.4x at F10, 700mm, 1/2000, -1.7EV, ISO 1600.

Sigma 150-600mm, F7.1, 600mm, 1/1600, -.7EV, ISO 250.

I am have a hard time Spending $2,700 for the Canon lens & $500 on the 1.4x??
Sigma tells me their 1.4x is better than Canon’s, I will have to rent one to find out.

Sigma makes good lenses. The less expensive ones will be softer at the longest end of the range. I would expect the more expensive ones to be better. I would expect the Canon lens to have better stabilization and faster AF, but how much better you want to pay for is a choice.

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I have a Sigma 18-300 with a macro feature. I bought it because of price, and so I didn’t have to keep changes lenses in the field. I know lazy LOL.

Works great for me. Any “soft” issues, which seem minimal to me at 100%, I’ve been able to fix in post, over 90% of the time.