If you warch the reunion kiss in slo-mo (it's all I have; my Toshiba won't do slo-mo), each has his moments, but Heath is never off. Heath bounds down the stairs, never hesitating; Jack seems to be timing his approach so he'll meet heath at the right place. Heath starts it by kissing JaKe on the neck, in the hug part, and then they both start looking at each other's mouths. Then Ennis (seem to be going back and forth here), starts looking ariound, and then he pushes Jack a long, long way against the wall. At first Jack is smiling, like a kid (whee! We're goin ' for a ride!) and then the smile fades, and by ther time he's against the wall, his mouth is slightly open. But I think the smile is a little silly. But Heath kisses Jack just like he kisses the grirl in Casanova, except harder: his mouth is open a mile. Jack's eyes are great when the clinch breaks, but his mouth puckers too much before hiis part of the kiss. Jack's best is when he's trying to get at Ennis's mouth after Ennis has broken it; doesn't understand about the surveillance cameras. Ennis has to pry Jack's arm loose from around his head...
End of report. I never once thought they were doing anythng but acting, watching them both in slo-mo. But Heath was doing a slightly better job, except at the end, when they're both great.