If you get an 055 alloy, they are very reasonably priced. What you will likely notice quickly is the weight, and I think alloy just "feels" and "handles" heavier than CF, probably even at the same weight. Tough to articulate.
If you are looking at Gitzo Series 2 vs 3, consider the pricing carefully. Looking at the shop's offerings and elsewhere I don't see much difference in price at the moment via USA offerings. And in fact, right now, the Series 3 Systematic my be the least cost of the two series (in the USA).
If you are looking the Gitzo 2 vs 3 from a size/bulk/weight point of view, that is a different matter and depends on some very specific personal considerations in terms of how you use it and carry it about.
I am not aware of any tap test results between the Magica and Systematic, so can't comment at all on Jerry's thoughts in that matter.