SX50 Buzzard at different settings

I took several photos of this buzzard with my SX50. Some at 215mm optical zoom only, some at 215 + x1.5 TC, and some at 215 + x2.0 TC. I then cropped them to around the same size. In the three examples below I think the best IQ is at 215 only, then 215 + 1.5 TC and finally 215 + 2.0 TC. Lesser quality at the two TC settings may well have been because of my inability to hold the camera steady and / or the fact that the bird moved slightly. J