I have the Apple sd card reader/adapter and it does NOT work for transferring pictures from the SD card to the iPhone6. It works great for the iPad mini though. I'm not aware of any way to copy pics from an sd card directly to an iPhone.
However... going forward I will probably use my microsoft surface for grabbing pics off of the cameras. It was waaaaaayy faster for importing pics and I can import them to a specific folder which makes them a lot easier to organize when you have several cams.
For example, on one camera I had so many pics it was taking dang near 30 minutes for the iPad to pull them off, my buddy had his surface and he copied them off in under a minute!