Part of it definitely came down to usage. The LCD-3 really is a little speaker which defeats the purpose of using my headphones instead of my monitors with others around. But sound wise, the 846 is missing the very top end of the treble but has a micro detail and natural sounding level that just jives with me. It certainly helps that it has an out of the head stage that even now there are times I pull an ear out to make sure I didn't forget to turn off my speakers /facepalm I don't miss the LCD-3, not even a little bit. That I can take the 846 with me on my commute and use it at work... fantastic.
Does it mean I won't try other iems in an attempt to go up another level? No. But I'm in no rush either. What I am looking for now is swapping the big rig for something I can also bring with me without losing too much. AK240, Calyx M and possibly the DX90 and X5 are on my radar. Sadly finding a dap that does the usb dac properly... not proving easy to do :(