Fate/Zero yes! I have a tag for it here. I quite like it and think it’s excellently written with tighter writing than Unlimited Blade Works, but I still prefer UBW because the themes and arcs resonated more with me than Fate/Zero’s did (I am generally more inclined to like a hopeful story (and tragedies can be hopeful!) than a depressing one, but that’s just my personal taste). In fact, having seen UBW before Fate/Zero actually probably made me appreciate Fate/Zero more, because I knew the nihilism was leading somewhere beautiful.
Irisviel was my favorite character. 😛
Heaven’s Feel I haven’t seen yet, but I plan to!