Jim Chung wrote that interesting article (reposted with permission on 43rumors from jimchungblog.wordpress.com)

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Evaluating the MTF Improvements of Speed Booster Focal Reducers

DxOmark published the full Olympus E-M1II sensor test report. And there is only good news to report: The E-M1II has by far the best MFT sensor yet and comes really close to the performance of the top class Sony A6500 APS-C sensor. This is a remarkable achievement. They days are past when MFT sensor were scoring much lower results than Sony ‘s APS-C sensors. And of course it’s on par with the Canon APS-C sensor performance:

E-M1II at BHphoto, Amazon, GetOlympus and Adorama. In EU at ParkCameras. WexUK. Digitech.ch.

ePhotozine posted the full Meike 6.5mm MFT lens review:

The circular fisheye lens is a fairly specialised tool, the frame filling designs being much more prevalent and arguably more generally useful. However, who could argue with that f/2 aperture, with the quality of the results, with the excellent price, with the solid construction? The only difficulty is that judging manual focus is well nigh impossible, but the huge depth of field can cover most situations very well.
If we want to delve into the fisheye world at a reasonable cost and no compromise on quality, then this could well be a very strong contender.

The Meike 6.5mm is available at Amazon.com, Amazon.co.uk and Amazon.de.