It's best to either view the image at 100% or pull the little enlarging preview window in the Details panel until it shows a part of the image with a good amount of detail.
Then, know that your "normal" Lightroom sharpening is for "input" sharpening, which happens on the pixle level. When viewing an image at the "normal" viewing size, "Fit" or "Fill", you may or may not see the effects of "normal" pixel-level sharpening. You can crank up things in the Details panel but it may not look so good viewing at a larger size.
As was said, the 5D2 files are likely sharper out-of-camera than you are used to with the 7D files, do to the ultra-fine resolution of the 7D sensor and the anti-aliasing filter being stronger because of that and the softening effect the AA filter has on the pixel-level sharpness.
And then, there is "creative sharpening" and "output sharpening". With creative sharpening, Lightroom provides the local adjustment brush, which can be set to selectively apply sharpening (and softening) to parts of the image. This can provide some visual impact because you can create a "contrast" between a sharpened subject and a background that has been softened. See these two threads for a couple examples:
https://photography-on-the.net …/showthread.php?t=1127481
https://photography-on-the.net …/showthread.php?t=1128385
And then output sharpening is provided in the Lightroom Export and Printing dialogs. When you specify an image size and a "target" (screen, printing) in your Export dialog, ans specify a level of sharpening, LR sharpens as part of the process, taking the image size as well as the target into the calculation. I typically leave my sharpening level to Standard, because I don't like an "overdone" sharpening look. Others may vary.
Also, consider the fact that often when people view an image at a smaller size and "see" it as "soft", what you are really "seeing" is not really "Sharpening", as in fine detail being rendered sharply and crisply, but rather overall "contrast", which is often what we think of as "pop" and gets confused with actual sharpness. Out-of-camera jpegs have not just Sharpening applied but also Contrast and Saturation (along with the in-camera under-the-hood processing). This is why out-of-camera jpegs will appear to have more "pop", at least when viewed in an app like Lightroom. The Canon Raw software Digital Photo Professional (DPP) actually uses the in-camera settings to give a "jpeg-like preview" of your Raw file as a "starting point".
In fact, for anyone thrown off by using Lightroom, I advise installing DPP and using it as a "reference" alongside of Lightroom (or Camera Raw in Photoshop/Elements). You can change and tweak the Picture Styles in DPP to get an idea of what can be done, and then jump into using Lightroom and learn how to "match" the DPP "look"!