I feel the Steam version isn't latest version. Because it doesn't have hit sound.
I've watched gameplay videos of some players of the Steam version. No hit sound.
If you have package version, you got some differences between old & newer.
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1. Hit sound
Old version didn't have this. Crytek added this feature by patch (1.2?).
2. Body attack (we can smash NKs by body attack of speed mode)
Old version didn't have this feature. Crytek added this by patch (1.2?).
3. Nuke cutscene of last mission
We see monitor screen which represent the state of bombing in the cutscene. The monitor image is buggy in latest version. The alien energy field expands before bombing. But old version was correct. The energy field expand after the nuke.
4. Explosion effect of Hunter
When we kill the Hunter, he will explode. We can see an effect like electric shock in it. The effect of old version appear toward all direction. But the effect of newer version is "vertical" effect.
5. Game balance
Enemy durabiity of newer version is lower than old version.
Etc.
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Latest Steam version (resaled version) looks like old version.
But all steam version may be strange from the beginning, I don't know.
If you have Steam resaled version, I want you to check these.
And I want Crytek to check these. If Crytek released wrong version, they should fix...