Professional grade cameras usually include some kind of AFMA, or Autofocus Micro Adjustment feature. In the case of your lens, it probably just needs to be tuned for your particular 7D.

Canon Mark II telephoto lenses released in 20 (the 300mm & 400mm f/2.8 and 500mm & 600mm f/4 lenes) are some of the sharpest lenses on earth, and probably set to handle increasing sensor resolutions for the next decade or so (i.e. Any of Canon's Mark II L-series lenses are more than capable of resolving enough detail for a high density sensor. Lenses released within the last five years or so should be fine in most cases, unless you really have a need to extract every last ounce of resolution your 7D is capable of. Lens designs that are decades old may need to be replaced with something much newer to really provide the 7D's sensor what it needs. Older lenses may not be quite up to snuff when it comes to the spatial resolution of what they project on the sensor.

Your 70-200mm f/2.8 IS lens, even if it is a first generation, is not necessarily 'bad'. With a 7D, you need to address IQ-diminishing factors more aggressively. The large pixels of the 1D X are more forgiving of optical aberrations and a small amount of camera shake, as the effects can be largely contained within a single pixel.

The smaller the pixel pitch, the more magnified the effects of camera shake, poor lens quality, or improper AF micro focus adjustment will be. In terms of line pairs per millimeter (lp/mm), assuming the same focal length, same sufficiently wide aperture (say f/4), and subject distance.the 7D is capable of resolving details 61% smaller than the 1D X is capable of. The 7D's luminance spatial resolution is just shy of 116 lp/mm, where as the 1D X, despite having the same number of pixels, has a spatial resolution of 72 lp/mm. The 7D's 18 megapixels differs a lot from, say, the 1D X's 18 megapixels.in terms of spatial resolution. Megapixels and Line PairsĪ simple scalar number doesn't tell you the whole story though. When compared on a megapixels basis, 18mp doesn't sound like much.the 1D X has 18mp, the 5D III has 22mp, the D800 has 36.3mp. The Canon 7D is a very demanding camera, with a particularly demanding sensor.

Canon 7d firmware problems