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That lens but on the very first 'digital rebel' : http://kbeezie.deviantart.com/art/Ethan-Brick-and-Vines-52150887
But yea the 40 and 24 would give closer to the 'norm' field of view on an APS-C sized sensor . The 50mm on my first digital rebel made a nice Portrait lens (ie: 80mm equiv). When I moved to Pentax after that, one of my favorite lens was the Pentax 43mm f/1.9 Limited Edition... but that's pricey compared to the Canon 50/1.8 Mk II.
The 40mm STM is also made for full-frame and is a lot more well rounded, but is a stop and 1/3 slower which is not really a deal breaker, but is something to consider. You won't have as much bokeh and not as good for low light. This is why I consider the kit lens essential for beginners as it lets you figure out what specs are more important to you.
The 24mm STM is made for APSC sensors and will be slightly wide at 35mm full frame equivalent. It's a great all-purpose focal length and is about the focal length of most phone cameras, but you can't use it when upgrading to full frame. I'd recommend the kit 18-55 instead for the price. At wide angles, that extra 1/2 stop in aperture of the 24 isn't as useful, and the IS of the kit lens makes it better for low light. The 24 does have the advantage of size.