As he was said above, I see 0 difference between any of those images. I could not tell a single difference. Between them being small and the conversion of a jpeg, you lose the tiny details.
Yes, I have a TN monitor, that is because you have no choice what so ever for 120hz. Currently, only TN monitors can do 120hz. It's not some cheap ass monitor, it's a monitor with a purpose.
That said, it handles the conversion a lot better than previous monitors.