50mm

Anyone find 50mm sufficient for indoor wide shots?

On Crop or FF?

On Crop No, even 35 which is about the same FOV on a crop is not wide enough for indoor wide in my opinion.

Not even close. At my last two weddings I've had been absolutely stuffed without a 16mm lens on full frame. First one the lovely outdoor venue was too windy so they moved into a room about 2m wide - like sardines - so I had to be close to the big wedding party in this tiny room. Next one was in a bigger church, but I needed the wide view.

On crop you'd want 10mm.

Some parts of the world have different venues though, so that can change things.

Nope unless you crop very tight. It is very good for portraits but if you like more of storyteller approach get the 24mm or even wider.