To be even more picky, there are also many more factors you need to make known. Like what's the focal length used? same for both pic? Did you resize or crop the pics, digital manipulation? Resolution of original? etc etc etc.
the pix are crop out from original and resize to about 50%. that's about all.. Both pix are taken with a sigma 105mm lense, one with TC, one without. Actually i wanna find out whether TC cause image to be softer. The focus point is the eye area.
If I were to do something like this: This is how it should be done.
Going with the above, I MIGHT say pic 2.
However, in my limited knowledge, for a comparison to be really fair, you need to control all the elements.
For example, when using the TC, you must increase camera to subject distance to maintain same coverage (not the most elequent description...but the idea is that the subject should fill the same amount of space in frame with and without TC)., then lighting must be same. aperture used the same. (shutter speed same?), as economics go...ceteris parabus....
Now I'm just waiting for some pro to prove me wrong and tell me that I'm an idiot spouting nonsense that I don't know at all