No, it's pretty hard to compare vista's uptake to 8's. It's not the same time period, not the same PC type, not the same market scenario, and not the same tech scenario. Back in vista's day, we had Windows Mobile, and the iphone barely was released. The desktop PC was the reigning king of the PC, laptops were emerging as the form factor of choice, and the Windows OS itself was shite. It wasn't just because of third party issues, but it was genuinely a half-cooked, Windows Server modded version of Windows with glass and shininess. The economy was one that people weren't worried so much about job security, low wages, and potentially losing their money. At that time, it was the height of the housing market.
Move onto to Windows 8, Windows Phone 8 has been released, the iphone is the top most used smartphone platform out there, "app" is a word and is overly concerned about as ios and android rely on those third party apps for a decent experience, the desktop PC has been considered dead and only really for the technologically enabled, gamers, enterprise, and people that need a lot of power. The laptop form factor is the de facto standard of the PC, the tablet form factor is predicted to emerge soon as the form factor of choice in a couple of years. The Windows operating system itself is a matured kernel of vista, runs better than xp or 7 (some will debate this) and is the most controversial version since 95. The economy is one where people are worried about debt and paying it off, not enough jobs, not enough qualifications, not enough well paying jobs at least. The market in the US at least is slowly picking up something. Also, the PC's that people bought four years ago is just fine enough to run Windows 8, 9, and/or 10 without issue as the hardware standards were raised due to vista, with Microsoft committed to make Windows EVEN more efficient as we're seeing with the Blue leak.
Windows vista and 8 aren't even close comparisons to each other, xp and 8 might be a better comparison as the economy back then was slowing down due to the internet bubble and 9/11. Shoot, xp even started this whole "tablet PC/tablet computing" wave...