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The 1.4x would have been (IMO) a better way of getting nearer the 600mm mark, with no loss of aperture values.
Problem was that at 560mm the 100-400mm II with the 1.4x MKIII wasn't as sharp as the Sigma 150-600mm Sport at 600mm.
At 400mm the Canon is sharper, it is also a lot less front heavy so easily manageable on the M5