Select the most appropriate option, out of the five options given for each of the following sentences, which in your view, should be grammatically and structurally correct. Please note that the meaning and the context of the sentence must not change. 
1). This is the first time in my life that I am seeing an amazing painting as of this. 
2). This is the first time in my life that I see an amazing painting as of this. 
3). This is the first time in my life that I have seen an amazing painting like this. 
4). This is the first time in my life that I saw an amazing painting like this.