Based on what you described, I would describe that upgrade path as "foolish."

Certainly you are entitled to spend your money how you see fit, but it seems like buying a $1600 lens (can't imagine how much it costs in Brazil) is a piss-poor investment. Lenses certainly hold their value (until newer better models come along). But can you justify the nearly $1200 increase over the excellent 50 f1.4?

From what I know, pro's even have a hard time justifying the cost--only those with the need for the extra ~1/2 stop of light and the extra sharpness wide open consider it.

I guess I would look at it this way: if you can't out-shoot someone using the $400 50 f1.4 with your $1600 50 f1.2L, then it's a huge waste.

I know where you're coming from though. I lust after owning the best gear I can afford. I'll buy contractor grade power-tools even though I have no business owning them.

The question is, is the difference between the "best" and "good-enough" worth it? Do you want the 50 1.2L because of the prestige of owning one? Or is it because you need the extra bit of light it provides. It is a good lens, and if money was no object I'd have one for every day of the week.

Now, I could be way of the mark. The extra bit of light could be make it or break it. But you have to answer yourself honestly, as to why you want the lens. I upgraded my $500 17-40L for the $1400 16-35F2.8 because that extra stop of light was crucial (extra 1mm was too). But, my favorite photos were still taken with the 17-40L, so go figure.