I've been experimenting with a new lens for my Panasonic GH4, it's the Panasonic 14-140 F/3.5-5.6, and so far I think the lens is a great all-around lens.  It's small, lightweight and sharp, perfect for traveling.  I shot these videos with autofocus which is kind of a no-no in videography but I thought the lens did pretty well with these fast moving ird.  

I've been thinking about doing more wildlife videography and this is like a test video.