Pathfinder formatted into a modern setting certainly has. D20 Modern as well as Modern Path have both done games with a d20 mechanic set in modern-day Earth. Modern Adventures is different from those games in any ways.
• Technology: There has been a massive technological jump since d20 Modern was published in 2002 that Modern Adventures delves deeper into. Advances in cell phone, computer processor, drones, weapons and other technological advancements are taken into account and explored thoroughly in the equipment section.
• Races: Modern Adventures remains loyal to the race system found in the Pathfinder OGL, giving each race their own place in the world, themes and history. Races are given the detail and fluff they need to be played comfortably within the setting.The core book will explore the parts the other races played in significant events in history, as well as current events. New races have been added as well, such as the insect-like Acaroi and Half-Gnomes. The Half-Bloods supplement will delve more deeply into what happens when modern genetic research meets these races, and what happens when fertility treatments and other scientific fertiliy methods allow a couple from different races that were previously unable to conceive, a chance to do so.
• Skills: Whereas other "similar" games using modern Earth as a setting use an older set of skills, Modern Adventures uses an updated version of skills that simplifies the array, such as turning climb, swim and acrobatics into athletics, and bringing rogue skills like hide and move silently into stealth.
• Fluff: While the Modern Adventures core book has all the great crunch that you'd expect in a Pathfinder OGL game, it also contains some great fluff writing that explores world history and current events, and how magic, monsters and even the different races took part and affected them.
In the end, while there have been a few other games that have ported the Pathfinder or d20 system into a modern setting, Modern Adventures does so in a very unique way.