How do Austrian sparkling wines, such as Sekt, compare to Champagne?

In reference to the production of Austrian Sekt and Champagne, promising to bring sparkle into each, they have something in common which is secondary fermentation utilised to achieve effervescence. However, they differ in the type of grapes involved,production methods and stylistic expression. Sekt is home to fermented grapes from indigenous kinds such as Grüner Veltliner and Welschriesling which makes the beverage fresh, fragrant and tasty. In addition to this, Austrian firms dabble quite a lot in the traditional bottle fermentation method, similar to Champagne, however they extend aging periods up to being a lot more complex and layered.