A comparison between the Canon MPE65mm macro, the Sigma 70mm macro and the Sigma 150mm macro.
Images from the test can be found here: Test images
An early assessment of this test shows that whilst there is a little difference betwen the frames covered at 1:1 (as marked onthe lenses) the frame area covered is basically the same and for a field shot the difference would not be noticable.
Further whilst an above view gives a good idea of frame area it does appear to suffer the limitation that a focus error during shooting can cause possible erroring results - a repeat test might be performed with the setup at an angle so as to reduce the chances of a focus error giving incorrect results.
Preliminary results from this test though I would say:
At f8 65mm clearly the sharpest, followed by the 150mm. The 70mm is showing considerable softness and this might be a missfocus.
At f10 65mm is clearly the sharpest again, followed by the 150mm and 70mm which show very similar levels of performance (further suggesting that the f8 results for the 70mm might be flawed.
At f13 the 65mm and 70mm give very similar performance whilst the 150mm appears to be more noticably softer.
As in previous tests these results are unedited save for white balance setting in the RAW editing process (all other settings were kept as standard). Further even though results from the 70mm and 150mm might be in question the obvious evidence is that the 65mm performs to a fantastic level of sharpness at each of the tested apertures
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