Leaving tough runs in Eng and SA aside,
I think what Virat is done in Aus is highly under rated. You will get some hard runs and some soft runs in your entire career, but Virat has 7 away tons in Aus. Some one might say, so what it's just 7 tons. Guess what,
Not including Indian players,
Only 8 batsmen in 55 years of history have scored more than 7 away tons in SENA (SA + Aus + Eng + NZ combined). I am not talking about any one venue, but 4 venues taken together.
Why? Because it's that hard to score away tons in SENA taken together even for players from SENA.
Virat has scored 7 away tons in just one SENA country when Aus had a simply a top class bowling side.
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It does not make Virat a greater player than Lara/Viv/Smith etc, but it simply shows that best of the best have 8-10 away tons taken together in 4 venues. It's hard for even best players in history. Anyone thinking that you can get soft runs when playing away too many times is mistaken. You can get 1-2 soft tons but not too many when playing away against good sides.
Otherwise we would have seen lot more batsmen with lot more away tons in SENA 55 years of history. Tons of batsmen got oppurtunity to score away tons in not just Aus, but also in SA, Eng and NZ. And yet we have so few.
That's why I rate away performance in tough tours highly and don't see logic to equate it with home even if conditions are hard. Tons of batsmen have tough runs at home, because it's their home condition. But very few in history have scored heavily away against good sides.
Virat's 7 tons in Aus is simply stand out performacne in entire histiry of cricket for any batsman. It's extremely under rated by fans.