Not personally. For me a few differences stand out.
1. Sega's vast diversity compared to Atari even at peak from a business standpoint.
2. If you go back to Atari about 13 years ago, you will see that their profits dropped and their losses continued to grow. Sega has done the exact opposite. 10 years ago it would not be uncommon to see Sega report losses of upwards of half a billion, with some sectors losing hundreds of millions(such as consumer R&D). Now? Most of Sega's divisions are break even or small dozen million dollar losses, on an alternating big release schedule which often sees profit during certain phases. Sure they still total up, but nowhere near as bad as back then.
TLDR there, Atari continued to lose more money, Sega has consistently lost less money as time went on.
3. Sega doesn't sell IP, despite the wishes of fanbase segments. Atari's collapse was accelerated by the fact that, the overwhelming majority of their games became licensed properties, rather than in house. They ended up losing the publishing rights to Unreal to Midway, they sold Civilization, Xcom, Railroads ect to Firaxis/2K. They sold of Falcon to Graphism, they sold hasbro back most of their IP rights with some exception. They even sold away in house development studios after acquiring them while knowingly building up debt. Something Sega has not done.
Atari was in a league of HERP DERP that is far bigger than Sega is currently, or looking to be. The comparison sounds good on paper, but in reality is something entirely different.