Hi Yanko, nice to hear your Metz is serrving you well and you re happy using it. It is entitrly possible that the combination MY K5 and THIS Metx was just not working together. I upgraded the firmware - did not help any!
Let me summarize the issues I had with the flash -
1) PTTL. Overexposure or underexposure using different modes (direct on-camera/on camera bounced/remote direct/remote bounced) exposures can be compensated since they under/over-expose consistently within one mode, but inconsistently among all the modes. Sometimes however I get inconsistent exposures even within one mode of usage as well. (which when happens I would characterize as the final cut to my soul)
2) Manual remote mode (called servo in Metz) does not work as expected and leves some exposure of the controller flash. Which should NOT happen
3) WB. Weird material
probably the most puzzling of all, but not the most serious. Never occured to me with another flash - I have an older Pentax TTL flash which I use with my film SF7 and which is very good, on-camera flash and YN56 - great flash. I could NEVER figure out how the WB of the camera works with the Metz. Simply selecting Flash-WB and checking the picture later reveals the JPG image in the camera has different balance compared to the WB preview.
4) Using the menus is very very tedious. I did not enjoy too much the flash it was a torture to scroll all those menus all the time. This is subjective - everyone else is happy with the menus.
So here's a recap of my misery with the Metz. I suppose I am stupid/wrong or my K-5 didn't like this Metz or it was broken cokmpletely. But in all cases I have to put up to the circumstances