Alright, so opinions are like a***holes. Everyone's got one - and here's mine. The 24-70ii is completely worth investing in. I use mine a lot (almost exclusively for street/walk around/landscape) but pretty much always use my primes for wedding/paid portraiture work. Both types of lenses are well used and I see great benefit in both options. For a holiday (even a honeymoon), I'd be looking at it as an excuse to pony up for the 24-70ii. I wondered if I'd regret replacing my crusty old, rarely used 24-70 with what I thought was effectively the same sort of thing but I couldn't have been more wrong.