IQ of 400 f5.6 + 1.4 vs Sig / Tam 150-600's ?

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Blind Bill Regular Member • Posts: 166
IQ of 400 f5.6 + 1.4 vs Sig / Tam 150-600's ?

I own the Canon 70-300L and am looking to buy something with a bit more reach (and don't want to sell this lens). The quality of the 'old' 400 f/5.6 speaks for itself but the range of the 150-600's tempts me and can't be ignored. However, IQ means more to me than other considerations. Forgoing the reach of the 600's, will I be happy with a 400 5.6 + 1.4 tele??

 Blind Bill's gear list:Blind Bill's gear list
Canon EOS 5D Mark III Canon EF 400mm f/5.6L USM Canon EF 100mm f/2.8 Macro USM Canon EF 70-300mm f/4-5.6L IS USM Canon Extender EF 1.4x III +2 more
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