Pick one out of the many available (!) Unlike the 70-200 F4IS, from which images literally breathe air and ring with sharpness, the L-ka will not be shooting on the F4 frames that are pleasing to the eye in every regard. While the right lens is preferable, having the 24-105 on hand for the other 10% of the time is a huge help. Overall, I'd give it a strong 4—maybe even a 5.
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