It depends on the frequency and how high the inverted vee is, proportional to operating wavelength.
If you build a 144 MHz (two meter) inverted vee and stick it up 30' above ground, it will have a figure-8 pattern like a horizontal dipole does. So will a non-inverted vee (that is, a dipole with a low center and higher ends). In fact, since 30' at 144 MHz is about five wavelengths, it pretty much won't matter if the vee is inverted or not, the antenna's effectively in free space anyway.
At HF, a lot changes because most of us can't get our antennas up high enough to have the pattern we think it should. Then, ground reflection is also very helpful, to the extent that it's not uncommon for a dipole to have several dB gain "over a dipole," at some angles.
My 40-80-160m inverted vee (it's 80-meter sized, with 40m traps and 80m traps that act as loading on 160) has a very distinct "dipole like" pattern on 40 meters but becomes more omnidirectional, with a higher radiation angle than I'd usually like to have, on 80 and 160. It's up about 55 feet above ground.
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