Well, it’s all here: http://en.wikipedia.org/wiki/Schlieffen_Plan
The main difference is, that in reality the Germans didn’t make their right wing as strong as it should have been according to the original plan. The plan called for a particularly massive German right flank sweeping through the Low Countries and North West France, and reaching as far as the Channel. The center (Alsace-Lorraine) as well as the Eastern front (against the Russians) would be relatively weak. The idea was, to defeat France before Russia could mobilize in force.
So that entire plan is very different from the 1870 Franco-German war, when Germany first defeated an initial French advance into the Rhineland, and then won a series of victories in Northern France. But I don’t think that the plan as originally conceived, would have met with great success. The main flaws in the original Schlieffen plan were, imho:
(a) It banked on a slow Russian mobilization - in reality, the Russians invaded soon, and while they were soundly defeated, their initial advance required an answer of course.
(b) It called for an invasion of the Netherlands, which would not have contributed much to the main purpose of defeating France and would have consumed valuable additional resources to defeat the Dutch.
I hold it for possible that a different modification of the plan would have been more successful, however. If the right flank had been reinforced at the cost of Alsace-Lorraine, while still meeting the Russians and invading Belgium only, then the Germans might have reached the Channel ports in time, and it could have been more difficult for the British to land in great numbers. But that’s still pretty tough, considering the available roads and means of transportation.
Anyway, that wouldn’t be the original Schlieffen plan, so the answer that most closely resembles my view on the original plan would have been “Germans get slowed down and get defeated near Paris, while the Russian horde takes East Prussia”.
