Sigma 150-500 OS vs Canon 100-400 L IS question

I am considering buying a telephoto lens for use with 5D. I hope to do some lunar shots as well as wildlife.
The Canon 100-400 range can be extended with converters, whereas I gather the Sigma 150-500 can't (correct me if I'm wrong).
The Sigma is heavier, but costs significantly less.
So I would be interested in feedback from owners of either, especially the Sigma which is a fairly recent release.
My question is basically about IQ - is the Sigma in any way comparable with the Canon 100-400?

I have used the 100-400 L and own the 150-500. I think that the IQ is slightly better on the 100-400, but everything else is a toss up or won by the Sigma. The Sigma has better bokeh, a better OS system, more reach, and is much cheaper (when comparing new prices). AF is equal IMO.

As to TCs neither lens will AF on a 5D with a reporting TC. You need to either use a non-reporting TC or tape the pins. You will need good light for either lens when using a TC

In2Photos wrote in post #6204232
As to TCs neither lens will AF on a 5D with a reporting TC. You need to either use a non-reporting TC or tape the pins. You will need good light for either lens when using a TC

Thanks a lot for your reply. I have never used a TC, so perhaps you could comment further. I take it from what you say that I can in fact extend the Sigma 150-500 reach with a TC - I can get over the non AF - but what make/model of TC is suitable?

In2Photos wrote in post #6204232
I have used the 100-400 L and own the 150-500. I think that the IQ is slightly better on the 100-400, but everything else is a toss up or won by the Sigma. The Sigma has better bokeh, a better OS system, more reach, and is much cheaper (when comparing new prices). AF is equal IMO.

As to TCs neither lens will AF on a 5D with a reporting TC. You need to either use a non-reporting TC or tape the pins. You will need good light for either lens when using a TC

not weight or size.

ed rader

Pixels wrote in post #6204620
Thanks a lot for your reply. I have never used a TC, so perhaps you could comment further. I take it from what you say that I can in fact extend the Sigma 150-500 reach with a TC - I can get over the non AF - but what make/model of TC is suitable?

I use the Tamron 1.4x TC on mine. I have read that the Canon version will not fit.

Here are a couple of shots from that combo on my MKII.

700mm, ISO1250, f/8 (f/11 with TC), 1/500, OS mode 1, Monopod

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Those are impressive images - I am leaning towards the Sigma - will make final decision over next few days. Thanks again for feedback.