It complicates things that you'll have to include $10 more vs MP1, but theoretically you can never be given bad odds on a flush draw in a 3-way pot, esp since you're drawing to the nut flush.

However, I probably fold here because I'm kinda expecting someone to have a flush already (reason being that 2 players seem very happy with their hand suddenly when a 3rd heart shows up, which normally scares the crap out of everyone), ie I have less outs than I think probably.