Here's a couple of comparison shots for your reference...
These are:
1. Arc Recon Trooper with sniper rifle from Critical Mass Games
2. New Vistula Legion specialist from Oddzial Osmy
3. Spug drone from Spriggan Miniatures
4. SAS Infantry with plasma rifle from Micropanzer
5. Chewke from Khurasan Miniatures
The figures shown above are, from left to right:
1. Arc Recon Trooper with sniper rifle from Critical Mass Games
2. Sepulvedan Resistance Fighter from Khurasan Miniatures
3. New Vistula Legion trooper from Oddzial Osmy
4. Jaka Walsh from Khurasan Miniatures
5. Muster Troops Command from 15mm.co.uk
More pics of 15mm scifi stuff at
http://eclipsingbinaries15mm.blogspot.com/