Apple is usually not the first on a technology, but when they get there they nail it. Yeah, took years to include NFC - but for a technology this you-can't-screw-this-up important, they waited (and prepared!) for years for a confluence of events before delivering

Pay.
Sure there was NFC "wallets" before. None of them went anywhere.
Now, because Apple nailed it with one product, none of the competitors will go anywhere. A magnetic-field sled? really? even if built into the phone, it's maintaining compatibility with exactly what Apple is well on its way to replace outright, akin to announcing support via a USB floppy-disk when Apple ditched floppies entirely in favor of CDs, thumb drives, and AirDrop.
There's a difference between biding your time while others screw things up, vs scrambling to catch up to someone else's big win. To use the analogy: Sure Google was moving the puck, but not getting anywhere with it; Apple spent the NFC game skating to where the puck would be and could make a winning shot with it; Samsung saw Apple hit the puck and now is diving to block it, but is too far from the goal to stop it.