No, not even close. The most dominating front seven in the History of the NFL was the Fearsome Foursome, the Purple Gang, the Steel Curtain and the Doomsday Defense, all were more talented then the Bears front seven in 85, IMO. That 85 Bears team did it because of the 46 scheme. Not as much talent IMO. Once teams figured out the 46, game over.
You're giving an opinion as am I it's all based on opinion but the 85 Bears defense is mentioned by many as the greatest defense in NFL history primarily due to their front 7 that destroyed QB's en route to a 15-1 season and a 36 point blowout win in the SB. Offensively the Bears were average and were led by an average QB but the team is ranked as one of the top 5 greatest teams in NFL history due to their dominating defense that annihilated QB's. The Bears defense combined for 136 sacks in 84 (setting an NFL record with 72) and in 85. The Rams Fearsome Foursome and the Vikings Purple Gang were great "defensive lines" but they never led their teams to a championship.
The Purple Gang kept coming up short in SB's the Vikings were dominated in each of their 4 SB appearances while the Fearsome Foursome never even reached a SB. The Steel Curtain was no doubt a great defense due to their consistency over a period of several years but that defense was being complimented by a great offense that had Hall of Famers on the OL, at QB, RB and at both WR positions. Both sides of the ball were loaded with HOF players. No defense other than maybe the 2000 Ravens had as dominating a "season" defensively as the 85 Bears. Both teams won SB's in blowouts due to their great defenses. The 2000 Ravens had an average offense and arguably the worst QB to ever lead a team to a SB championship.
The 2000 Ravens went 4 straight games scoring only 6 offensive points but their defense only allowed an average of 10 points a game. The Seahawks blowout of the Broncos in the SB is why their defense is being compared to the 85 Bears, 2000 Ravens and some of the other great defenses. The Seahawks defense is being judged off the 2013 season. Judging the greatest front 7/defenses in NFL history is based on whether you're judging off of consistency over a period of seasons or one great season. The greatest offenses in NFL history are judged by one great statistical season. Every offense is measured by what the 1999 Rams greatest show on turf accomplished as well as the 2007 Pats and now the 2013 Broncos.
Everyone looks at the numbers. As great as the Steel Curtain defense was the Steelers never won a SB by more than 10 points. Both the Cowboys and Rams had success against the Steel Curtain and the Rams were being led by an average QB in Vince Ferragamo. What ultimately won those SB's for the Steelers was their explosive offense that couldn't be stopped in the 4th quarter. It was Bradshaw to Swann and Stallworth that sealed those victories. In all 4 of the Steelers SB victories it was future HOF offensive players (Harris, Swann and Bradshaw twice) that were named the games MVP. In the 85 Bears SB win it was Richard Dent who was named the games MVP. For the 2000 Ravens SB win it was Ray Lewis named the games MVP. For the 2002 Bucs it was Dexter Jackson a safety named the SB MVP and for the 2013 Seahawks it was Malcolm Smith named the SB MVP. All those teams won SB's with great defensive performance throughout the season and in the SB.
Regardless of the scheme it takes damn good players to be a dominate defense and the 85 Bears had some damn good players check their roster. The Cowboys ran the Tampa 2 this past season that the 2002 Bucs dominated with but the Cowboys ended up with one of the worst defenses in NFL history because they don't have a Warren Sapp, Derrick Brooks, John Lynch or a Ronde Barber. Regardless of the scheme the Cowboys defense sucks because they have a bunch of average players that don't even know where to line up. They looked like crap under Wades scheme for most of his tenure and under Ryan's scheme that's worked fine in NO. I don't care what scheme you run you have to have good players for the scheme to work.