Unless the lens is so awful or the body/film collimation is totally out of whack or the light meter/film speeds are completely off, you won't see very visible different results between different cameras in postcard sized photos....
Perhaps directly comparing a top len's result to a mediocre one, you'd see a difference at that size, but how a camera is used will usually outweigh that (again, unless the camera is defective).
So, while certainly not my first choice asa camera, a Minolta X700 is undoubtedly good enough for most purposes.

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