5D Mark III upgrade help

I am planning to upgrade to 5D mark III from Canon 60D soon. The only disadvantage I see is on board pop up flash missing in 5D. With a FF do I need an on board flash? I do have an external flash that I can use, but lot of time I do not carry the external flush for extra baggage where the pop up helped. I know 5D III ISO performance is far far better than my current 60D. Please help me decide, do I really have a concern here. Thanks

Just forget about the on board flash and use an external flash. You'll be amazed by the photos.

The lack of a onboard flash is the one shortcoming with the 5D series. Though the on-board is not nearly as good as an external, it is convenient to have when flash is needed. The higher ISO capability of the 5D series is nice but it is not a substitute for flash. You will have to carry an external flash as part of your kit. No way around that.

I personally never use the pop-up flash and carry my external flash with me for each photo shooting opportunity, sometimes I don't need it but it's always there if I do.

My suggestion is to get used to carrying the external with you, you'll get accustomed to it and you'll find that you get better results anyway.

So in answer to your question: No, I don't think that you will miss the pop-up...Go for the 5Dm3 and get used to carrying your flash with you, it's really not that much of a burden.

Or just keep the 60D as a backup as it has a pop up.

Not having flash at all will limit your shooting, so you will probably want to haul around the external flash. While the 5D3 has MUCH better high ISO, meaning you won't need flash to light the scene as much, that doesn't mean that you wouldn't benefit from fill flash. The onboard flash of most DSLR's makes an ideal fill flash that is always available. I don't get why they don't add it to the more expensive bodies, other than maybe a concern with weather sealing on the 1D series.

What they should to is a make a very compact "fill flash" unit that you can easily carry in your pocket if you need it. They could even incorporate it with the wireless transmitter for the RT series.

Definitely keep the 60d as a backup.
I personally have never used the pop up flash on my 60d or 550d so it wouldn't concern me.
I suppose Canon figures if you care enough about the quality of your photos to buy a 5 series, you wouldn't use a pop up flash anyway lol