After several months of intensive self introspection, along with a substantial increase in my shooting enjoyment and over-the-moon happiness with my results, I've decided that me and the 500PF are meant to be. I've been hanging onto my 600mm f/4 lens with the thought that I'd eventually pass through the usual honeymoon phase and come to see the obvious superiority of the king f/4 lens, but in all honesty I think I'm a better, more effective photographer with this 500PF. It shouldn't be this way: this lens makes my bird photography easier, and I like my shots better, but that just can't be true! The 600 f/4 is a $13k lens and it weighs double, so it has to be better, right?! More background blur = better, that's common knowledge!
This shot of a migrant Northern Parula (and most other Passerines) require a ton of patience, luck, and the ability to hold a stress pose that entails being completely still while holding the camera/lens up in the shooting position while looking upwards. You best believe that the 1DX2 + 600 f/4 + 1.4x TC would have smoked my arms within a few minutes, and the need to rest would have resulted in a large movement that scared this Parula off. With the D500 + 500PF, I was a motionless, marble statue, and was able to get this shot, plus shots of numerous other species without moving out of position. NO way I would have done that with my 600 setup unless I was using a tripod. Even from my super-stable sitting position, the 600 would have fatigued me in short order.
Is the lesser background blur a big deal? Yes and no.... if you put yourself in a position to where your shot isn't ideal for pleasing background separation, you're asking for trouble. So, my goal is to get better at better composing photos. It's a lot more challenging, sure, but I'm loving it. If I bin a shot because the background blur stinks, not too often would the same shot be salvageable even with a 600 f/4.
What about sharpness and detail? Nope. I'm 100% loving this Nikon setup more than any Canon I've ever shot. End of story. I'm finding the D500 sensor is an absolute gem when it comes to noise control and cleanup. And for sharpness... the 500PF is a laser scalpel.
How about absolute reach? For how I shoot, I'm comfortable in the 750-850mm FOV. I don't take super sniper pot shots at birds, I like to be within ~20 feet, sometimes closer, and the 600 actually starts to get unwieldy, whereas the lighter 500PF and it's wider field of view + shorter MFD give me a more comfortable envelope to get the closer, more detailed shots. If I need to reach out and touch something in a pinch, I have the 1.4TC, though I rarely use it. Again, I want to be in close, too much reach can be a detriment.
In the end, I think I've just come to the realization that often times that extra "nth %" of performance doesn't actually translate into better photos, and allowing myself to be OK with that has been a great learning experience. Bonus is that I get to recoup some money when it sells 
Oh, here's the Northern Parula:
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