Thanks for taking the time to reply George. I've only noticed the issue before when doing motorsport, but yesterday it just seemed to struggle a bit to focus on a blonde-haired pale-faced lady in low level tungsten light. I can't post a picture as there were certain people who's pictures can't be put on a forum. My settings certainly might need a tweak - any thoughts on what ? ISO was up to 3200, continuous focus, 60th of a second, and moving from one face to another, again using the outer focus points just seemed to leave the X-H1 struggle to grab onto the other face (also pale and blonde, so not much contrast). I'm certainly no expert on weddings, but always did a lot of low light people stuff so figured I was reasonably ok with my technique.The only answer I can offer to this is, until I decided to use freelance photographers for my high end motorsport (including F1) business we as a company were using X-H1 units exclusively for all of my staff photographers without any problems with regards to focusing whatsoever. We also used these units in low light (evening meetings) and never experienced a focusing problem.
As you can imagine an F1 car tends to move a tad quicker than anything at a wedding so in all honesty I wonder if maybe some of the settings you have on your X-H1 could do with a bit of tweaking for what you are shooting. As for wedding work the X-H1 should absolutely walk it, low light included.