The last one is the best for me, without doubt! Very nice presentation too. I need a macro lens! I have the Zuiko 50mm f2 and I've heard of some people using it on the NEX even though it's not right for the sensor size. I don't mind any vignetting it may cause as I nearly always add it anyway! Waiting to see some examples before I go searching for an adapter.
Believe me, shoot macro with NEX + 100mm macro isn't easy. The rate of success is very low compare to using Canon EOS DSLR. Tremor/handshake is main problem. So even this Kiron 105/2,8 have 1:1 maginification. I cannot use it in closest distance, yet. except for still object.Those are fantastic shots! I have a 50mm macro but I keep reading and seeing photos like yours that are convincing me that I need to get a 100mm macro lens.