Awesome advices right there :-)
In the very first moment I was thinking about 70-300 L and now I am considering it back.
I nave seen a bunch of shots come with it band sede rally nice.
70-300 L mantains f/4 from 70 to.....?
According to TDP, the 70-300L is at f/4 from 70-103, f/4.5 from 104-154, f/5 from 155-228 and f/5.6 from 229-300, so you lose up to 2/3 of a stop compared to the 70-200 f/4. The 70-300L is fatter but shorter than the 70-200 f/4, which helps because it takes less space in larger camera bags (vertical versus on its side). If you plan to be above 200mm a lot (i.e. using a TC), the 70-300L may be a better option. A variable max aperture is not a big deal unless you plan on using manual settings a lot. Either lens will do fine outdoors in adequate light, but both will push ISOs higher for dim/indoor situations, where f/2.8 lens and FF bodies really help.