I'd second what everyone else has said, but one thing I will point out is that as far as breadth and flexibility goes, PCs in FC are definitely much "stronger" than in TOG. If you're familiar with the class tier system, pretty much every class in FC is a solid tier 3: Awesome in their primary focus, able to pull their weight in a variety of situations even where their primary focus isn't relevant, and not utterly trivializing challenges unless you really go out of your way to munchkin out your build and/or the challenge in question plays directly to your primary strength.
I'd say this is mostly thanks to the skill system, which is designed to make all skills pretty broadly useful (the skill list is fairly condensed, and basically everything in combat besides regular attacks is skill-based), allow even low-skill characters to have a relatively large assortment of skills without compromising effectiveness in their primary role, and generally isn't easily replaced/circumvented by magic due to the ways magic has been reined in. For instance, the first time I ran a campaign, it struck me that everyone in the party ended up having enough ranks in social/investigative skills that I could easily throw a political intrigue adventure at them without making anyone feel useless or left out, even though nobody except for maybe the Mage was really trying to make a character geared toward social intrigue type stuff at all. It just so happened that they had the points to play with after buying up everything they really needed for their primary schtick (and/or specialties they picked for benefits pertaining to their primary schtick happened to also have Paired Skill benefits that fed into social or investigative skills).
The skill-based approach to special combat manuevers, along with the meatier combat feats and new trick/proficiency system, also helps to make combat more varied and dynamic rather than just the "stand still and trade blows" pattern of TOG. Which doesn't strictly make the PCs "more powerful" in relation to the challenges they face, necessarily, but it does create a feel of generally more competent characters. My players in that first campaign were really impressed with how flexible and tactically interesting combat was even at level 1.