The X3 is just as much a "Pro" unit as the X5. Don't kid yourself into thinking it isn't.
Both produce gorgeous 4K images and both have the same flying characteristics.
Just because you pay a considerable price more for the X5 you think it is better? DJI loves people who think so.
The X5 is only marginally better. The camera is slightly more sensitive, I get that, and it has the capability for SDOF, I get that too.
But for everything else, no difference. A complete waste of your money, unless you are always shooting at dusk and need to always focus on something near, which could be the case for some of you, but the majority don't and won't need this feature.