Good lens, but with weaknesses

The lens outstanding build quality; everything looks high quality finish, nothing hakelt.
At the dainty OM-D but it seems almost a bit too big and without the additional battery grip I do not imagine taking pictures with this combination.
The image stabilization with the OIS lens and on the 5-axis stabilization of the camera works fine even with the switched-on the digital camera telephoto converter (= max. 1200mm KB) are hand-held photography possible.
The images are sharp, the colors do and there are no vignetting. The autofocus camera blends well and fast with the lens.
Unfortunately fall in the upper zoom range to significant chromatic aberrations that otherwise tarnish the good impression a bit.
Conclusion: Good but not perfect