If this camera is mostly for your wife I think you've answered your own question. She prefers the 70D flippy screen and zoom lenses. Get her a 70D and either the EF-S 17-55 f2.8 or the EF-S 15-85. Keep the 24-105 L for your camera or sell it if you really don't think you will use it. (It would work great on the 70D too, but she might want a wider angle on the short end.)
On the other hand, if this is actually a second body for you to use, with occasional use by your wife, then there are other considerations that come into play. Extent of weather sealing? Value of built-in flash? Video? Lens focal lengths (current longest is ~100mm, on crop that is like 160mm, but your shortest lens is now more like 28mm on crop. Crop changes the utility of your existing lenses.) Will you use two bodies at once? (I.E. double harness-different lenses on each body. In that case similar control layout is more significant.)
Obviously IQ can be a consideration, but you have to be honest with yourself. What will you be doing with images from "your wife's camera?" Making huge prints? Pixel peeping on a 27" monitor? Sharing jpg's with friends? It's your call.
I have been shooting photos for publication for nearly 5 decades. My most used camera is a 60D. The reality is most of my shots are used on the web, in newsletters, flyers, maps and occasional catalog shots. Two page spreads are pretty rare these days. The 60D handles all that with ease. For travel I have an Olympus OMD E-M5 which is lighter with better weather sealing. Critical work - 5DII. My wife uses a G-15 because, as she says, "it fits my purse."
Good luck with you choice. None of the options are bad.
On the other hand, if this is actually a second body for you to use, with occasional use by your wife, then there are other considerations that come into play. Extent of weather sealing? Value of built-in flash? Video? Lens focal lengths (current longest is ~100mm, on crop that is like 160mm, but your shortest lens is now more like 28mm on crop. Crop changes the utility of your existing lenses.) Will you use two bodies at once? (I.E. double harness-different lenses on each body. In that case similar control layout is more significant.)
Obviously IQ can be a consideration, but you have to be honest with yourself. What will you be doing with images from "your wife's camera?" Making huge prints? Pixel peeping on a 27" monitor? Sharing jpg's with friends? It's your call.
I have been shooting photos for publication for nearly 5 decades. My most used camera is a 60D. The reality is most of my shots are used on the web, in newsletters, flyers, maps and occasional catalog shots. Two page spreads are pretty rare these days. The 60D handles all that with ease. For travel I have an Olympus OMD E-M5 which is lighter with better weather sealing. Critical work - 5DII. My wife uses a G-15 because, as she says, "it fits my purse."
Good luck with you choice. None of the options are bad.
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