Here's a video of El G's 1999 1500m WC win:
http://www.youtube.com/watch?v=s6jrqsbD3Pc
El G runs 3:27.65 which only two people in history have ever run faster than. Obviously the race was 'rabbited' through 800 in ~1:52 but the last 20 seconds of this video show a slow-mo head on shot of him running down the final straight and there is absolutely NO strain on his face whatsoever.
At least Ngeny looks like he's hurting and his form is starting to go slightly. El G literally looks as though he's on a normal training run. He had just run one of the fastest times ever and he's not even close to maxed out.
I generally try to give athletes the benefit of the doubt when it comes to doping or PED or whatever but that seems like the only logical explanation for this right?