I don't think you can really compare or guess at this as technology in the fantasy universe is artificially retarded by gw.
As an example if you take sigmar as basic iron age the amount of years that have passed far outstrips the numbers that have passed since our iron age yet the Empire is barely reaching the equivallent tech of our rennaissance era.
Other races have fared even worse The highelves haven't advanced technologicaly since the war of the beard which equates to the humans neolithic era and he Dwarves have not done much better only using blackpowder on a level with the 15th century.
The main reason for this is to keep 40k and fantasy as 2 seperate games systems so the chances of the Empire ever reaching steampunk levels are unlikely.
Factor in aswell that in general war breeds inovation the Empire should be miles ahead of us as they've been under constant threat of war of some sort or another since Sigmar.
<img src="https://www.heresy-online.net/daemons/adoptables/888.gif" alt="Broken Daemon Image" /><br><a
Last edited by neilbatte; 09-13-10 at 08:58 AM.